1 /* $OpenBSD: init_main.c,v 1.312 2021/12/07 22:17:02 guenther Exp $ */ 2 /* $NetBSD: init_main.c,v 1.84.4.1 1996/06/02 09:08:06 mrg Exp $ */ 3 4 /* 5 * Copyright (c) 1995 Christopher G. Demetriou. All rights reserved. 6 * Copyright (c) 1982, 1986, 1989, 1991, 1992, 1993 7 * The Regents of the University of California. All rights reserved. 8 * (c) UNIX System Laboratories, Inc. 9 * All or some portions of this file are derived from material licensed 10 * to the University of California by American Telephone and Telegraph 11 * Co. or Unix System Laboratories, Inc. and are reproduced herein with 12 * the permission of UNIX System Laboratories, Inc. 13 * 14 * Redistribution and use in source and binary forms, with or without 15 * modification, are permitted provided that the following conditions 16 * are met: 17 * 1. Redistributions of source code must retain the above copyright 18 * notice, this list of conditions and the following disclaimer. 19 * 2. Redistributions in binary form must reproduce the above copyright 20 * notice, this list of conditions and the following disclaimer in the 21 * documentation and/or other materials provided with the distribution. 22 * 3. Neither the name of the University nor the names of its contributors 23 * may be used to endorse or promote products derived from this software 24 * without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 29 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 36 * SUCH DAMAGE. 37 * 38 * @(#)init_main.c 8.9 (Berkeley) 1/21/94 39 */ 40 41 #include <sys/param.h> 42 #include <sys/filedesc.h> 43 #include <sys/file.h> 44 #include <sys/errno.h> 45 #include <sys/exec.h> 46 #include <sys/kernel.h> 47 #include <sys/kthread.h> 48 #include <sys/mount.h> 49 #include <sys/proc.h> 50 #include <sys/resourcevar.h> 51 #include <sys/signalvar.h> 52 #include <sys/systm.h> 53 #include <sys/namei.h> 54 #include <sys/vnode.h> 55 #include <sys/tty.h> 56 #include <sys/conf.h> 57 #include <sys/buf.h> 58 #include <sys/device.h> 59 #include <sys/socketvar.h> 60 #include <sys/lockf.h> 61 #include <sys/protosw.h> 62 #include <sys/reboot.h> 63 #include <sys/user.h> 64 #ifdef SYSVSHM 65 #include <sys/shm.h> 66 #endif 67 #ifdef SYSVSEM 68 #include <sys/sem.h> 69 #endif 70 #ifdef SYSVMSG 71 #include <sys/msg.h> 72 #endif 73 #include <sys/domain.h> 74 #include <sys/event.h> 75 #include <sys/msgbuf.h> 76 #include <sys/mbuf.h> 77 #include <sys/pipe.h> 78 #include <sys/task.h> 79 #include <sys/witness.h> 80 #include <sys/smr.h> 81 82 #include <sys/syscall.h> 83 #include <sys/syscallargs.h> 84 85 #include <uvm/uvm_extern.h> 86 87 #include <ufs/ufs/quota.h> 88 89 #include <net/if.h> 90 #include <net/rtable.h> 91 #include <net/netisr.h> 92 93 #if defined(CRYPTO) 94 #include <crypto/cryptodev.h> 95 #include <crypto/cryptosoft.h> 96 #endif 97 98 #if defined(KUBSAN) 99 extern void kubsan_init(void); 100 #endif 101 102 #if defined(NFSSERVER) || defined(NFSCLIENT) 103 extern void nfs_init(void); 104 #endif 105 106 #include "stoeplitz.h" 107 #if NSTOEPLITZ > 0 108 extern void stoeplitz_init(void); 109 #endif 110 111 #include "mpath.h" 112 #include "vscsi.h" 113 #include "softraid.h" 114 115 const char copyright[] = 116 "Copyright (c) 1982, 1986, 1989, 1991, 1993\n" 117 "\tThe Regents of the University of California. All rights reserved.\n" 118 "Copyright (c) 1995-2021 OpenBSD. All rights reserved. https://www.OpenBSD.org\n"; 119 120 /* Components of the first process -- never freed. */ 121 struct session session0; 122 struct pgrp pgrp0; 123 struct proc proc0; 124 struct process process0; 125 struct plimit limit0; 126 struct vmspace vmspace0; 127 struct sigacts sigacts0; 128 struct process *initprocess; 129 struct proc *reaperproc; 130 131 extern struct user *proc0paddr; 132 133 struct vnode *rootvp, *swapdev_vp; 134 int boothowto; 135 int db_active = 0; 136 int ncpus = 1; 137 int ncpusfound = 1; /* number of cpus we find */ 138 volatile int start_init_exec; /* semaphore for start_init() */ 139 140 #if !defined(NO_PROPOLICE) 141 long __guard_local __attribute__((section(".openbsd.randomdata"))); 142 #endif 143 144 /* XXX return int so gcc -Werror won't complain */ 145 int main(void *); 146 void check_console(struct proc *); 147 void start_init(void *); 148 void db_ctf_init(void); 149 void prof_init(void); 150 void init_exec(void); 151 void futex_init(void); 152 void taskq_init(void); 153 void timeout_proc_init(void); 154 void pool_gc_pages(void *); 155 void percpu_init(void); 156 157 struct emul emul_native = { 158 SYS_syscall, 159 SYS_MAXSYSCALL, 160 sysent, 161 }; 162 163 #ifdef DIAGNOSTIC 164 int pdevinit_done = 0; 165 #endif 166 167 /* 168 * System startup; initialize the world, create process 0, mount root 169 * filesystem, and fork to create init and pagedaemon. Most of the 170 * hard work is done in the lower-level initialization routines including 171 * startup(), which does memory initialization and autoconfiguration. 172 */ 173 /* XXX return int, so gcc -Werror won't complain */ 174 int 175 main(void *framep) 176 { 177 struct proc *p; 178 struct process *pr; 179 struct pdevinit *pdev; 180 extern struct pdevinit pdevinit[]; 181 extern void disk_init(void); 182 183 /* 184 * Initialize the current process pointer (curproc) before 185 * any possible traps/probes to simplify trap processing. 186 */ 187 curproc = p = &proc0; 188 p->p_cpu = curcpu(); 189 190 /* 191 * Initialize timeouts. 192 */ 193 timeout_startup(); 194 195 /* 196 * Attempt to find console and initialize 197 * in case of early panic or other messages. 198 */ 199 config_init(); /* init autoconfiguration data structures */ 200 consinit(); 201 202 printf("%s\n", copyright); 203 204 #ifdef KUBSAN 205 /* Initialize kubsan. */ 206 kubsan_init(); 207 #endif 208 209 WITNESS_INITIALIZE(); 210 211 KERNEL_LOCK_INIT(); 212 SCHED_LOCK_INIT(); 213 214 rw_obj_init(); 215 uvm_init(); 216 disk_init(); /* must come before autoconfiguration */ 217 tty_init(); /* initialise tty's */ 218 cpu_startup(); 219 220 random_start(boothowto & RB_GOODRANDOM); /* Start the flow */ 221 222 /* 223 * Initialize mbuf's. Do this now because we might attempt to 224 * allocate mbufs or mbuf clusters during autoconfiguration. 225 */ 226 mbinit(); 227 228 #if NSTOEPLITZ > 0 229 stoeplitz_init(); 230 #endif 231 232 /* Initialize sockets. */ 233 soinit(); 234 235 /* Initialize SRP subsystem. */ 236 srp_startup(); 237 238 /* Initialize SMR subsystem. */ 239 smr_startup(); 240 241 /* 242 * Initialize process and pgrp structures. 243 */ 244 procinit(); 245 246 /* Initialize file locking. */ 247 lf_init(); 248 249 /* 250 * Initialize filedescriptors. 251 */ 252 filedesc_init(); 253 254 /* 255 * Initialize pipes. 256 */ 257 pipe_init(); 258 259 /* 260 * Initialize kqueues. 261 */ 262 kqueue_init(); 263 264 /* 265 * Initialize futexes. 266 */ 267 futex_init(); 268 269 /* Create credentials. */ 270 p->p_ucred = crget(); 271 p->p_ucred->cr_ngroups = 1; /* group 0 */ 272 273 /* 274 * Create process 0 (the swapper). 275 */ 276 pr = &process0; 277 process_initialize(pr, p); 278 279 LIST_INSERT_HEAD(&allprocess, pr, ps_list); 280 LIST_INSERT_HEAD(PIDHASH(0), pr, ps_hash); 281 atomic_setbits_int(&pr->ps_flags, PS_SYSTEM); 282 283 /* Set the default routing table/domain. */ 284 process0.ps_rtableid = 0; 285 286 LIST_INSERT_HEAD(&allproc, p, p_list); 287 pr->ps_pgrp = &pgrp0; 288 LIST_INSERT_HEAD(TIDHASH(0), p, p_hash); 289 LIST_INSERT_HEAD(PGRPHASH(0), &pgrp0, pg_hash); 290 LIST_INIT(&pgrp0.pg_members); 291 LIST_INSERT_HEAD(&pgrp0.pg_members, pr, ps_pglist); 292 293 pgrp0.pg_session = &session0; 294 session0.s_count = 1; 295 session0.s_leader = pr; 296 297 atomic_setbits_int(&p->p_flag, P_SYSTEM); 298 p->p_stat = SONPROC; 299 pr->ps_nice = NZERO; 300 pr->ps_emul = &emul_native; 301 strlcpy(pr->ps_comm, "swapper", sizeof(pr->ps_comm)); 302 303 /* Init timeouts. */ 304 timeout_set(&p->p_sleep_to, endtsleep, p); 305 306 /* Initialize signal state for process 0. */ 307 signal_init(); 308 siginit(&sigacts0); 309 pr->ps_sigacts = &sigacts0; 310 311 /* Create the file descriptor table. */ 312 p->p_fd = pr->ps_fd = fdinit(); 313 314 /* Create the limits structures. */ 315 lim_startup(&limit0); 316 pr->ps_limit = &limit0; 317 318 /* Allocate a prototype map so we have something to fork. */ 319 uvmspace_init(&vmspace0, pmap_kernel(), round_page(VM_MIN_ADDRESS), 320 trunc_page(VM_MAX_ADDRESS), TRUE, TRUE); 321 p->p_vmspace = pr->ps_vmspace = &vmspace0; 322 323 p->p_addr = proc0paddr; /* XXX */ 324 325 /* 326 * Charge root for one process. 327 */ 328 (void)chgproccnt(0, 1); 329 330 /* Initialize run queues */ 331 sched_init_runqueues(); 332 sleep_queue_init(); 333 sched_init_cpu(curcpu()); 334 p->p_cpu->ci_randseed = (arc4random() & 0x7fffffff) + 1; 335 336 /* Initialize timeouts in process context. */ 337 timeout_proc_init(); 338 339 /* Initialize task queues */ 340 taskq_init(); 341 342 /* Initialize the interface/address trees */ 343 ifinit(); 344 345 /* Lock the kernel on behalf of proc0. */ 346 KERNEL_LOCK(); 347 348 #if NMPATH > 0 349 /* Attach mpath before hardware */ 350 config_rootfound("mpath", NULL); 351 #endif 352 353 /* Configure the devices */ 354 cpu_configure(); 355 356 /* Configure virtual memory system, set vm rlimits. */ 357 uvm_init_limits(&limit0); 358 359 /* Per CPU memory allocation */ 360 percpu_init(); 361 362 /* Initialize the file systems. */ 363 #if defined(NFSSERVER) || defined(NFSCLIENT) 364 nfs_init(); /* initialize server/shared data */ 365 #endif 366 vfsinit(); 367 368 /* Start real time and statistics clocks. */ 369 initclocks(); 370 371 #ifdef SYSVSHM 372 /* Initialize System V style shared memory. */ 373 shminit(); 374 #endif 375 376 #ifdef SYSVSEM 377 /* Initialize System V style semaphores. */ 378 seminit(); 379 #endif 380 381 #ifdef SYSVMSG 382 /* Initialize System V style message queues. */ 383 msginit(); 384 #endif 385 386 /* Create default routing table before attaching lo0. */ 387 rtable_init(); 388 389 /* Attach pseudo-devices. */ 390 for (pdev = pdevinit; pdev->pdev_attach != NULL; pdev++) 391 if (pdev->pdev_count > 0) 392 (*pdev->pdev_attach)(pdev->pdev_count); 393 #ifdef DIAGNOSTIC 394 pdevinit_done = 1; 395 #endif 396 397 #ifdef CRYPTO 398 crypto_init(); 399 swcr_init(); 400 #endif /* CRYPTO */ 401 402 /* 403 * Initialize protocols. 404 */ 405 domaininit(); 406 407 initconsbuf(); 408 409 #if defined(GPROF) || defined(DDBPROF) 410 /* Initialize kernel profiling. */ 411 prof_init(); 412 #endif 413 414 /* Enable per-CPU data. */ 415 mbcpuinit(); 416 kqueue_init_percpu(); 417 uvm_init_percpu(); 418 419 /* init exec and emul */ 420 init_exec(); 421 422 /* Start the scheduler */ 423 scheduler_start(); 424 425 /* 426 * Create process 1 (init(8)). We do this now, as Unix has 427 * historically had init be process 1, and changing this would 428 * probably upset a lot of people. 429 * 430 * Note that process 1 won't immediately exec init(8), but will 431 * wait for us to inform it that the root file system has been 432 * mounted. 433 */ 434 { 435 struct proc *initproc; 436 437 if (fork1(p, FORK_FORK, start_init, NULL, NULL, &initproc)) 438 panic("fork init"); 439 initprocess = initproc->p_p; 440 } 441 442 randompid = 1; 443 444 /* 445 * Create any kernel threads whose creation was deferred because 446 * initprocess had not yet been created. 447 */ 448 kthread_run_deferred_queue(); 449 450 /* 451 * Now that device driver threads have been created, wait for 452 * them to finish any deferred autoconfiguration. Note we don't 453 * need to lock this semaphore, since we haven't booted any 454 * secondary processors, yet. 455 */ 456 while (config_pending) 457 tsleep_nsec(&config_pending, PWAIT, "cfpend", INFSLP); 458 459 dostartuphooks(); 460 461 #if NVSCSI > 0 462 config_rootfound("vscsi", NULL); 463 #endif 464 #if NSOFTRAID > 0 465 config_rootfound("softraid", NULL); 466 #endif 467 468 /* Configure root/swap devices */ 469 diskconf(); 470 471 #ifdef DDB 472 /* Make debug symbols available in ddb. */ 473 db_ctf_init(); 474 #endif 475 476 if (mountroot == NULL || ((*mountroot)() != 0)) 477 panic("cannot mount root"); 478 479 TAILQ_FIRST(&mountlist)->mnt_flag |= MNT_ROOTFS; 480 481 /* Get the vnode for '/'. Set p->p_fd->fd_cdir to reference it. */ 482 if (VFS_ROOT(TAILQ_FIRST(&mountlist), &rootvnode)) 483 panic("cannot find root vnode"); 484 p->p_fd->fd_cdir = rootvnode; 485 vref(p->p_fd->fd_cdir); 486 VOP_UNLOCK(rootvnode); 487 p->p_fd->fd_rdir = NULL; 488 489 /* 490 * Now that root is mounted, we can fixup initprocess's CWD 491 * info. All other processes are kthreads, which merely 492 * share proc0's CWD info. 493 */ 494 initprocess->ps_fd->fd_cdir = rootvnode; 495 vref(initprocess->ps_fd->fd_cdir); 496 initprocess->ps_fd->fd_rdir = NULL; 497 498 /* 499 * Now can look at time, having had a chance to verify the time 500 * from the file system. Reset p->p_rtime as it may have been 501 * munched in mi_switch() after the time got set. 502 */ 503 LIST_FOREACH(pr, &allprocess, ps_list) { 504 nanouptime(&pr->ps_start); 505 TAILQ_FOREACH(p, &pr->ps_threads, p_thr_link) { 506 nanouptime(&p->p_cpu->ci_schedstate.spc_runtime); 507 timespecclear(&p->p_rtime); 508 } 509 } 510 511 uvm_swap_init(); 512 513 /* Create the pageout daemon kernel thread. */ 514 if (kthread_create(uvm_pageout, NULL, NULL, "pagedaemon")) 515 panic("fork pagedaemon"); 516 517 /* Create the reaper daemon kernel thread. */ 518 if (kthread_create(reaper, NULL, &reaperproc, "reaper")) 519 panic("fork reaper"); 520 521 /* Create the cleaner daemon kernel thread. */ 522 if (kthread_create(buf_daemon, NULL, &cleanerproc, "cleaner")) 523 panic("fork cleaner"); 524 525 /* Create the update daemon kernel thread. */ 526 if (kthread_create(syncer_thread, NULL, &syncerproc, "update")) 527 panic("fork update"); 528 529 /* Create the aiodone daemon kernel thread. */ 530 if (kthread_create(uvm_aiodone_daemon, NULL, NULL, "aiodoned")) 531 panic("fork aiodoned"); 532 533 #if !defined(__hppa__) 534 /* Create the page zeroing kernel thread. */ 535 if (kthread_create(uvm_pagezero_thread, NULL, NULL, "zerothread")) 536 panic("fork zerothread"); 537 #endif 538 539 #if defined(MULTIPROCESSOR) 540 /* Boot the secondary processors. */ 541 cpu_boot_secondary_processors(); 542 #endif 543 544 /* Now that all CPUs partake in scheduling, start SMR thread. */ 545 smr_startup_thread(); 546 547 config_process_deferred_mountroot(); 548 549 /* 550 * Okay, now we can let init(8) exec! It's off to userland! 551 */ 552 start_init_exec = 1; 553 wakeup((void *)&start_init_exec); 554 555 /* 556 * Start the idle pool page garbage collector 557 */ 558 #if !(defined(__m88k__) && defined(MULTIPROCESSOR)) /* XXX */ 559 pool_gc_pages(NULL); 560 #endif 561 562 start_periodic_resettodr(); 563 564 /* 565 * proc0: nothing to do, back to sleep 566 */ 567 while (1) 568 tsleep_nsec(&proc0, PVM, "scheduler", INFSLP); 569 /* NOTREACHED */ 570 } 571 572 /* 573 * List of paths to try when searching for "init". 574 */ 575 static char *initpaths[] = { 576 "/sbin/init", 577 "/sbin/oinit", 578 "/sbin/init.bak", 579 NULL, 580 }; 581 582 void 583 check_console(struct proc *p) 584 { 585 struct nameidata nd; 586 int error; 587 588 NDINIT(&nd, LOOKUP, FOLLOW, UIO_SYSSPACE, "/dev/console", p); 589 error = namei(&nd); 590 if (error) { 591 if (error == ENOENT) 592 printf("warning: /dev/console does not exist\n"); 593 else 594 printf("warning: /dev/console error %d\n", error); 595 } else 596 vrele(nd.ni_vp); 597 } 598 599 /* 600 * Start the initial user process; try exec'ing each pathname in "initpaths". 601 * The program is invoked with one argument containing the boot flags. 602 */ 603 void 604 start_init(void *arg) 605 { 606 struct proc *p = arg; 607 vaddr_t addr; 608 struct sys_execve_args /* { 609 syscallarg(const char *) path; 610 syscallarg(char *const *) argp; 611 syscallarg(char *const *) envp; 612 } */ args; 613 int options, error; 614 long i; 615 register_t retval[2]; 616 char flags[4], *flagsp; 617 char **pathp, *path, *ucp, **uap, *arg0, *arg1 = NULL; 618 619 /* 620 * Now in process 1. 621 */ 622 623 /* 624 * Wait for main() to tell us that it's safe to exec. 625 */ 626 while (start_init_exec == 0) 627 tsleep_nsec(&start_init_exec, PWAIT, "initexec", INFSLP); 628 629 check_console(p); 630 631 /* process 0 ignores SIGCHLD, but we can't */ 632 p->p_p->ps_sigacts->ps_sigflags = 0; 633 634 /* 635 * Need just enough stack to hold the faked-up "execve()" arguments. 636 */ 637 #ifdef MACHINE_STACK_GROWS_UP 638 addr = USRSTACK; 639 #else 640 addr = USRSTACK - PAGE_SIZE; 641 #endif 642 p->p_vmspace->vm_maxsaddr = (caddr_t)addr; 643 p->p_vmspace->vm_minsaddr = (caddr_t)(addr + PAGE_SIZE); 644 if (uvm_map(&p->p_vmspace->vm_map, &addr, PAGE_SIZE, 645 NULL, UVM_UNKNOWN_OFFSET, 0, 646 UVM_MAPFLAG(PROT_READ | PROT_WRITE, PROT_MASK, MAP_INHERIT_COPY, 647 MADV_NORMAL, 648 UVM_FLAG_FIXED|UVM_FLAG_OVERLAY|UVM_FLAG_COPYONW|UVM_FLAG_STACK|UVM_FLAG_SYSCALL))) 649 panic("init: couldn't allocate argument space"); 650 651 for (pathp = &initpaths[0]; (path = *pathp) != NULL; pathp++) { 652 #ifdef MACHINE_STACK_GROWS_UP 653 ucp = (char *)addr; 654 #else 655 ucp = (char *)(addr + PAGE_SIZE); 656 #endif 657 /* 658 * Construct the boot flag argument. 659 */ 660 flagsp = flags; 661 *flagsp++ = '-'; 662 options = 0; 663 664 if (boothowto & RB_SINGLE) { 665 *flagsp++ = 's'; 666 options = 1; 667 } 668 #ifdef notyet 669 if (boothowto & RB_FASTBOOT) { 670 *flagsp++ = 'f'; 671 options = 1; 672 } 673 #endif 674 675 /* 676 * Move out the flags (arg 1), if necessary. 677 */ 678 if (options != 0) { 679 *flagsp++ = '\0'; 680 i = flagsp - flags; 681 #ifdef DEBUG 682 printf("init: copying out flags `%s' %ld\n", flags, i); 683 #endif 684 #ifdef MACHINE_STACK_GROWS_UP 685 arg1 = ucp; 686 (void)copyout((caddr_t)flags, (caddr_t)ucp, i); 687 ucp += i; 688 #else 689 (void)copyout((caddr_t)flags, (caddr_t)(ucp -= i), i); 690 arg1 = ucp; 691 #endif 692 } 693 694 /* 695 * Move out the file name (also arg 0). 696 */ 697 i = strlen(path) + 1; 698 #ifdef DEBUG 699 printf("init: copying out path `%s' %ld\n", path, i); 700 #endif 701 #ifdef MACHINE_STACK_GROWS_UP 702 arg0 = ucp; 703 (void)copyout((caddr_t)path, (caddr_t)ucp, i); 704 ucp += i; 705 ucp = (caddr_t)ALIGN((u_long)ucp); 706 uap = (char **)ucp + 3; 707 #else 708 (void)copyout((caddr_t)path, (caddr_t)(ucp -= i), i); 709 arg0 = ucp; 710 uap = (char **)((u_long)ucp & ~ALIGNBYTES); 711 #endif 712 713 /* 714 * Move out the arg pointers. 715 */ 716 i = 0; 717 copyout(&i, (caddr_t)--uap, sizeof(register_t)); /* terminator */ 718 if (options != 0) 719 copyout(&arg1, (caddr_t)--uap, sizeof(register_t)); 720 copyout(&arg0, (caddr_t)--uap, sizeof(register_t)); 721 722 /* 723 * Point at the arguments. 724 */ 725 SCARG(&args, path) = arg0; 726 SCARG(&args, argp) = uap; 727 SCARG(&args, envp) = NULL; 728 729 /* 730 * Now try to exec the program. If can't for any reason 731 * other than it doesn't exist, complain. 732 */ 733 if ((error = sys_execve(p, &args, retval)) == 0) { 734 KERNEL_UNLOCK(); 735 return; 736 } 737 if (error != ENOENT) 738 printf("exec %s: error %d\n", path, error); 739 } 740 printf("init: not found\n"); 741 panic("no init"); 742 } 743