init_main.c revision 1.240
1 /* $NetBSD: init_main.c,v 1.240 2004/10/01 16:30:52 yamt 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 1.240 2004/10/01 16:30:52 yamt 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 88 #include "opencrypto.h" 89 #include "rnd.h" 90 91 #include <sys/param.h> 92 #include <sys/acct.h> 93 #include <sys/filedesc.h> 94 #include <sys/file.h> 95 #include <sys/errno.h> 96 #include <sys/callout.h> 97 #include <sys/kernel.h> 98 #include <sys/kcont.h> 99 #include <sys/mount.h> 100 #include <sys/proc.h> 101 #include <sys/kthread.h> 102 #include <sys/resourcevar.h> 103 #include <sys/signalvar.h> 104 #include <sys/systm.h> 105 #include <sys/vnode.h> 106 #include <sys/tty.h> 107 #include <sys/conf.h> 108 #include <sys/disklabel.h> 109 #include <sys/buf.h> 110 #include <sys/device.h> 111 #include <sys/disk.h> 112 #include <sys/exec.h> 113 #include <sys/socketvar.h> 114 #include <sys/protosw.h> 115 #include <sys/reboot.h> 116 #include <sys/user.h> 117 #include <sys/sysctl.h> 118 #include <sys/event.h> 119 #include <sys/mbuf.h> 120 #ifdef FAST_IPSEC 121 #include <netipsec/ipsec.h> 122 #endif 123 #ifdef SYSVSHM 124 #include <sys/shm.h> 125 #endif 126 #ifdef SYSVSEM 127 #include <sys/sem.h> 128 #endif 129 #ifdef SYSVMSG 130 #include <sys/msg.h> 131 #endif 132 #ifdef P1003_1B_SEMAPHORE 133 #include <sys/ksem.h> 134 #endif 135 #ifdef SYSTRACE 136 #include <sys/systrace.h> 137 #endif 138 #include <sys/domain.h> 139 #include <sys/namei.h> 140 #if NOPENCRYPTO > 0 141 #include <opencrypto/cryptodev.h> /* XXX really the framework */ 142 #endif 143 #if NRND > 0 144 #include <sys/rnd.h> 145 #endif 146 #ifndef PIPE_SOCKETPAIR 147 #include <sys/pipe.h> 148 #endif 149 #ifdef LKM 150 #include <sys/lkm.h> 151 #endif 152 153 #include <sys/syscall.h> 154 #include <sys/sa.h> 155 #include <sys/syscallargs.h> 156 157 #include <ufs/ufs/quota.h> 158 159 #include <miscfs/genfs/genfs.h> 160 #include <miscfs/syncfs/syncfs.h> 161 162 #include <machine/cpu.h> 163 164 #include <uvm/uvm.h> 165 166 #include <dev/cons.h> 167 168 #include <net/if.h> 169 #include <net/raw_cb.h> 170 171 /* Components of the first process -- never freed. */ 172 struct session session0; 173 struct pgrp pgrp0; 174 struct proc proc0; 175 struct lwp lwp0; 176 struct pcred cred0; 177 struct filedesc0 filedesc0; 178 struct cwdinfo cwdi0; 179 struct plimit limit0; 180 struct pstats pstat0; 181 struct vmspace vmspace0; 182 struct sigacts sigacts0; 183 #ifndef curlwp 184 struct lwp *curlwp = &lwp0; 185 #endif 186 struct proc *initproc; 187 188 int nofile = NOFILE; 189 int maxuprc = MAXUPRC; 190 int cmask = CMASK; 191 extern struct user *proc0paddr; 192 193 struct vnode *rootvp, *swapdev_vp; 194 int boothowto; 195 int cold = 1; /* still working on startup */ 196 struct timeval boottime; 197 time_t rootfstime; /* recorded root fs time, if known */ 198 199 __volatile int start_init_exec; /* semaphore for start_init() */ 200 201 static void check_console(struct proc *p); 202 static void start_init(void *); 203 void main(void); 204 205 extern const struct emul emul_netbsd; /* defined in kern_exec.c */ 206 207 /* 208 * System startup; initialize the world, create process 0, mount root 209 * filesystem, and fork to create init and pagedaemon. Most of the 210 * hard work is done in the lower-level initialization routines including 211 * startup(), which does memory initialization and autoconfiguration. 212 */ 213 void 214 main(void) 215 { 216 struct lwp *l; 217 struct proc *p; 218 struct pdevinit *pdev; 219 int s, error; 220 u_int i; 221 rlim_t lim; 222 extern struct pdevinit pdevinit[]; 223 extern void schedcpu(void *); 224 #if defined(NFSSERVER) || defined(NFS) 225 extern void nfs_init(void); 226 #endif 227 #ifdef NVNODE_IMPLICIT 228 int usevnodes; 229 #endif 230 231 /* 232 * Initialize the current LWP pointer (curlwp) before 233 * any possible traps/probes to simplify trap processing. 234 */ 235 l = &lwp0; 236 curlwp = l; 237 l->l_cpu = curcpu(); 238 l->l_proc = &proc0; 239 l->l_lid = 1; 240 241 /* 242 * Attempt to find console and initialize 243 * in case of early panic or other messages. 244 */ 245 consinit(); 246 printf("%s", copyright); 247 248 KERNEL_LOCK_INIT(); 249 250 uvm_init(); 251 252 /* Do machine-dependent initialization. */ 253 cpu_startup(); 254 255 /* Initialise pools. */ 256 link_pool_init(); 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 disk_init(); /* initialize disk list */ 283 tty_init(); /* initialize tty list */ 284 #if NRND > 0 285 rnd_init(); /* initialize RNG */ 286 #endif 287 #if NOPENCRYPTO > 0 288 /* Initialize crypto subsystem before configuring crypto hardware. */ 289 (void)crypto_init(); 290 #endif 291 /* Initialize the sysctl subsystem. */ 292 sysctl_init(); 293 294 /* Initialize process and pgrp structures. */ 295 procinit(); 296 297 #ifdef LKM 298 /* Initialize the LKM system. */ 299 lkm_init(); 300 #endif 301 302 /* 303 * Create process 0 (the swapper). 304 */ 305 p = &proc0; 306 proc0_insert(p, l, &pgrp0, &session0); 307 308 /* 309 * Set P_NOCLDWAIT so that kernel threads are reparented to 310 * init(8) when they exit. init(8) can easily wait them out 311 * for us. 312 */ 313 p->p_flag = P_SYSTEM | P_NOCLDWAIT; 314 p->p_stat = SACTIVE; 315 p->p_nice = NZERO; 316 p->p_emul = &emul_netbsd; 317 #ifdef __HAVE_SYSCALL_INTERN 318 (*p->p_emul->e_syscall_intern)(p); 319 #endif 320 strncpy(p->p_comm, "swapper", MAXCOMLEN); 321 322 l->l_flag = L_INMEM; 323 l->l_stat = LSONPROC; 324 p->p_nrlwps = 1; 325 326 callout_init(&l->l_tsleep_ch); 327 328 /* Create credentials. */ 329 cred0.p_refcnt = 1; 330 p->p_cred = &cred0; 331 p->p_ucred = crget(); 332 p->p_ucred->cr_ngroups = 1; /* group 0 */ 333 334 /* Create the file descriptor table. */ 335 p->p_fd = &filedesc0.fd_fd; 336 fdinit1(&filedesc0); 337 338 /* Create the CWD info. */ 339 p->p_cwdi = &cwdi0; 340 cwdi0.cwdi_cmask = cmask; 341 cwdi0.cwdi_refcnt = 1; 342 simple_lock_init(&cwdi0.cwdi_slock); 343 344 /* Create the limits structures. */ 345 p->p_limit = &limit0; 346 simple_lock_init(&limit0.p_slock); 347 for (i = 0; i < sizeof(p->p_rlimit)/sizeof(p->p_rlimit[0]); i++) 348 limit0.pl_rlimit[i].rlim_cur = 349 limit0.pl_rlimit[i].rlim_max = RLIM_INFINITY; 350 351 limit0.pl_rlimit[RLIMIT_NOFILE].rlim_max = maxfiles; 352 limit0.pl_rlimit[RLIMIT_NOFILE].rlim_cur = 353 maxfiles < nofile ? maxfiles : nofile; 354 355 limit0.pl_rlimit[RLIMIT_NPROC].rlim_max = maxproc; 356 limit0.pl_rlimit[RLIMIT_NPROC].rlim_cur = 357 maxproc < maxuprc ? maxproc : maxuprc; 358 359 lim = ptoa(uvmexp.free); 360 limit0.pl_rlimit[RLIMIT_RSS].rlim_max = lim; 361 limit0.pl_rlimit[RLIMIT_MEMLOCK].rlim_max = lim; 362 limit0.pl_rlimit[RLIMIT_MEMLOCK].rlim_cur = lim / 3; 363 limit0.pl_corename = defcorename; 364 limit0.p_refcnt = 1; 365 366 /* 367 * Initialize proc0's vmspace, which uses the kernel pmap. 368 * All kernel processes (which never have user space mappings) 369 * share proc0's vmspace, and thus, the kernel pmap. 370 */ 371 uvmspace_init(&vmspace0, pmap_kernel(), round_page(VM_MIN_ADDRESS), 372 trunc_page(VM_MAX_ADDRESS)); 373 p->p_vmspace = &vmspace0; 374 375 l->l_addr = proc0paddr; /* XXX */ 376 377 p->p_stats = &pstat0; 378 379 /* 380 * Charge root for one process. 381 */ 382 (void)chgproccnt(0, 1); 383 384 rqinit(); 385 386 /* Configure virtual memory system, set vm rlimits. */ 387 uvm_init_limits(p); 388 389 /* Initialize the file systems. */ 390 #if defined(NFSSERVER) || defined(NFS) 391 nfs_init(); /* initialize server/shared data */ 392 #endif 393 #ifdef NVNODE_IMPLICIT 394 /* 395 * If maximum number of vnodes in namei vnode cache is not explicitly 396 * defined in kernel config, adjust the number such as we use roughly 397 * 1.0% of memory for vnode cache (but not less than NVNODE vnodes). 398 */ 399 usevnodes = (ptoa((unsigned)physmem) / 100) / sizeof(struct vnode); 400 if (usevnodes > desiredvnodes) 401 desiredvnodes = usevnodes; 402 #endif 403 vfsinit(); 404 405 /* Configure the system hardware. This will enable interrupts. */ 406 configure(); 407 408 ubc_init(); /* must be after autoconfig */ 409 410 /* Lock the kernel on behalf of proc0. */ 411 KERNEL_PROC_LOCK(l); 412 413 #ifdef SYSVSHM 414 /* Initialize System V style shared memory. */ 415 shminit(); 416 #endif 417 418 #ifdef SYSVSEM 419 /* Initialize System V style semaphores. */ 420 seminit(); 421 #endif 422 423 #ifdef SYSVMSG 424 /* Initialize System V style message queues. */ 425 msginit(); 426 #endif 427 428 #ifdef P1003_1B_SEMAPHORE 429 /* Initialize posix semaphores */ 430 ksem_init(); 431 #endif 432 /* Attach pseudo-devices. */ 433 for (pdev = pdevinit; pdev->pdev_attach != NULL; pdev++) 434 (*pdev->pdev_attach)(pdev->pdev_count); 435 436 #ifdef FAST_IPSEC 437 /* Attach network crypto subsystem */ 438 ipsec_attach(); 439 #endif 440 441 /* 442 * Initialize protocols. Block reception of incoming packets 443 * until everything is ready. 444 */ 445 s = splnet(); 446 ifinit(); 447 domaininit(); 448 if_attachdomain(); 449 splx(s); 450 451 #ifdef GPROF 452 /* Initialize kernel profiling. */ 453 kmstartup(); 454 #endif 455 456 /* Initialize system accouting. */ 457 acct_init(); 458 459 #ifdef SYSTRACE 460 systrace_init(); 461 #endif 462 /* 463 * Initialize signal-related data structures, and signal state 464 * for proc0. 465 */ 466 signal_init(); 467 p->p_sigacts = &sigacts0; 468 siginit(p); 469 470 /* Kick off timeout driven events by calling first time. */ 471 schedcpu(NULL); 472 473 /* 474 * Create process 1 (init(8)). We do this now, as Unix has 475 * historically had init be process 1, and changing this would 476 * probably upset a lot of people. 477 * 478 * Note that process 1 won't immediately exec init(8), but will 479 * wait for us to inform it that the root file system has been 480 * mounted. 481 */ 482 if (fork1(l, 0, SIGCHLD, NULL, 0, start_init, NULL, NULL, &initproc)) 483 panic("fork init"); 484 485 /* 486 * Create any kernel threads who's creation was deferred because 487 * initproc had not yet been created. 488 */ 489 kthread_run_deferred_queue(); 490 491 /* 492 * Now that device driver threads have been created, wait for 493 * them to finish any deferred autoconfiguration. Note we don't 494 * need to lock this semaphore, since we haven't booted any 495 * secondary processors, yet. 496 */ 497 while (config_pending) 498 (void) tsleep((void *)&config_pending, PWAIT, "cfpend", 0); 499 500 /* 501 * Finalize configuration now that all real devices have been 502 * found. This needs to be done before the root device is 503 * selected, since finalization may create the root device. 504 */ 505 config_finalize(); 506 507 /* 508 * Now that autoconfiguration has completed, we can determine 509 * the root and dump devices. 510 */ 511 cpu_rootconf(); 512 cpu_dumpconf(); 513 514 /* Mount the root file system. */ 515 do { 516 domountroothook(); 517 if ((error = vfs_mountroot())) { 518 printf("cannot mount root, error = %d\n", error); 519 boothowto |= RB_ASKNAME; 520 setroot(root_device, 521 (rootdev != NODEV) ? DISKPART(rootdev) : 0); 522 } 523 } while (error != 0); 524 mountroothook_destroy(); 525 526 /* 527 * Initialise the time-of-day clock, passing the time recorded 528 * in the root filesystem (if any) for use by systems that 529 * don't have a non-volatile time-of-day device. 530 */ 531 inittodr(rootfstime); 532 533 CIRCLEQ_FIRST(&mountlist)->mnt_flag |= MNT_ROOTFS; 534 CIRCLEQ_FIRST(&mountlist)->mnt_op->vfs_refcount++; 535 536 /* 537 * Get the vnode for '/'. Set filedesc0.fd_fd.fd_cdir to 538 * reference it. 539 */ 540 if (VFS_ROOT(CIRCLEQ_FIRST(&mountlist), &rootvnode)) 541 panic("cannot find root vnode"); 542 cwdi0.cwdi_cdir = rootvnode; 543 VREF(cwdi0.cwdi_cdir); 544 VOP_UNLOCK(rootvnode, 0); 545 cwdi0.cwdi_rdir = NULL; 546 547 /* 548 * Now that root is mounted, we can fixup initproc's CWD 549 * info. All other processes are kthreads, which merely 550 * share proc0's CWD info. 551 */ 552 initproc->p_cwdi->cwdi_cdir = rootvnode; 553 VREF(initproc->p_cwdi->cwdi_cdir); 554 initproc->p_cwdi->cwdi_rdir = NULL; 555 556 /* 557 * Now can look at time, having had a chance to verify the time 558 * from the file system. Reset p->p_rtime as it may have been 559 * munched in mi_switch() after the time got set. 560 */ 561 proclist_lock_read(); 562 s = splsched(); 563 LIST_FOREACH(p, &allproc, p_list) { 564 KASSERT((p->p_flag & P_MARKER) == 0); 565 p->p_stats->p_start = mono_time = boottime = time; 566 LIST_FOREACH(l, &p->p_lwps, l_sibling) { 567 if (l->l_cpu != NULL) 568 l->l_cpu->ci_schedstate.spc_runtime = time; 569 } 570 p->p_rtime.tv_sec = p->p_rtime.tv_usec = 0; 571 } 572 splx(s); 573 proclist_unlock_read(); 574 575 /* Create the pageout daemon kernel thread. */ 576 uvm_swap_init(); 577 if (kthread_create1(uvm_pageout, NULL, NULL, "pagedaemon")) 578 panic("fork pagedaemon"); 579 580 /* Create the filesystem syncer kernel thread. */ 581 if (kthread_create1(sched_sync, NULL, NULL, "ioflush")) 582 panic("fork syncer"); 583 584 /* Create the aiodone daemon kernel thread. */ 585 if (kthread_create1(uvm_aiodone_daemon, NULL, &uvm.aiodoned_proc, 586 "aiodoned")) 587 panic("fork aiodoned"); 588 589 #if defined(MULTIPROCESSOR) 590 /* Boot the secondary processors. */ 591 cpu_boot_secondary_processors(); 592 #endif 593 594 /* Initialize exec structures */ 595 exec_init(1); 596 597 /* 598 * Okay, now we can let init(8) exec! It's off to userland! 599 */ 600 start_init_exec = 1; 601 wakeup((void *)&start_init_exec); 602 603 /* The scheduler is an infinite loop. */ 604 uvm_scheduler(); 605 /* NOTREACHED */ 606 } 607 608 void 609 setrootfstime(time_t t) 610 { 611 rootfstime = t; 612 } 613 614 static void 615 check_console(struct proc *p) 616 { 617 struct nameidata nd; 618 int error; 619 620 NDINIT(&nd, LOOKUP, FOLLOW, UIO_SYSSPACE, "/dev/console", p); 621 error = namei(&nd); 622 if (error == 0) 623 vrele(nd.ni_vp); 624 else if (error == ENOENT) 625 printf("warning: no /dev/console\n"); 626 else 627 printf("warning: lookup /dev/console: error %d\n", error); 628 } 629 630 /* 631 * List of paths to try when searching for "init". 632 */ 633 static const char *initpaths[] = { 634 "/sbin/init", 635 "/sbin/oinit", 636 "/sbin/init.bak", 637 NULL, 638 }; 639 640 /* 641 * Start the initial user process; try exec'ing each pathname in "initpaths". 642 * The program is invoked with one argument containing the boot flags. 643 */ 644 static void 645 start_init(void *arg) 646 { 647 struct lwp *l = arg; 648 struct proc *p = l->l_proc; 649 vaddr_t addr; 650 struct sys_execve_args /* { 651 syscallarg(const char *) path; 652 syscallarg(char * const *) argp; 653 syscallarg(char * const *) envp; 654 } */ args; 655 int options, i, error; 656 register_t retval[2]; 657 char flags[4], *flagsp; 658 const char *path, *slash; 659 char *ucp, **uap, *arg0, *arg1 = NULL; 660 char ipath[129]; 661 int ipx, len; 662 663 /* 664 * Now in process 1. 665 */ 666 strncpy(p->p_comm, "init", MAXCOMLEN); 667 668 /* 669 * Wait for main() to tell us that it's safe to exec. 670 */ 671 while (start_init_exec == 0) 672 (void) tsleep((void *)&start_init_exec, PWAIT, "initexec", 0); 673 674 /* 675 * This is not the right way to do this. We really should 676 * hand-craft a descriptor onto /dev/console to hand to init, 677 * but that's a _lot_ more work, and the benefit from this easy 678 * hack makes up for the "good is the enemy of the best" effect. 679 */ 680 check_console(p); 681 682 /* 683 * Need just enough stack to hold the faked-up "execve()" arguments. 684 */ 685 addr = (vaddr_t)STACK_ALLOC(USRSTACK, PAGE_SIZE); 686 if (uvm_map(&p->p_vmspace->vm_map, &addr, PAGE_SIZE, 687 NULL, UVM_UNKNOWN_OFFSET, 0, 688 UVM_MAPFLAG(UVM_PROT_ALL, UVM_PROT_ALL, UVM_INH_COPY, 689 UVM_ADV_NORMAL, 690 UVM_FLAG_FIXED|UVM_FLAG_OVERLAY|UVM_FLAG_COPYONW)) != 0) 691 panic("init: couldn't allocate argument space"); 692 p->p_vmspace->vm_maxsaddr = (caddr_t)STACK_MAX(addr, PAGE_SIZE); 693 694 ipx = 0; 695 while (1) { 696 if (boothowto & RB_ASKNAME) { 697 printf("init path"); 698 if (initpaths[ipx]) 699 printf(" (default %s)", initpaths[ipx]); 700 printf(": "); 701 len = cngetsn(ipath, sizeof(ipath)-1); 702 if (len == 0) { 703 if (initpaths[ipx]) 704 path = initpaths[ipx++]; 705 else 706 continue; 707 } else { 708 ipath[len] = '\0'; 709 path = ipath; 710 } 711 } else { 712 if ((path = initpaths[ipx++]) == NULL) 713 break; 714 } 715 716 ucp = (char *)USRSTACK; 717 718 /* 719 * Construct the boot flag argument. 720 */ 721 flagsp = flags; 722 *flagsp++ = '-'; 723 options = 0; 724 725 if (boothowto & RB_SINGLE) { 726 *flagsp++ = 's'; 727 options = 1; 728 } 729 #ifdef notyet 730 if (boothowto & RB_FASTBOOT) { 731 *flagsp++ = 'f'; 732 options = 1; 733 } 734 #endif 735 736 /* 737 * Move out the flags (arg 1), if necessary. 738 */ 739 if (options != 0) { 740 *flagsp++ = '\0'; 741 i = flagsp - flags; 742 #ifdef DEBUG 743 printf("init: copying out flags `%s' %d\n", flags, i); 744 #endif 745 arg1 = STACK_ALLOC(ucp, i); 746 ucp = STACK_MAX(arg1, i); 747 (void)copyout((caddr_t)flags, arg1, i); 748 } 749 750 /* 751 * Move out the file name (also arg 0). 752 */ 753 i = strlen(path) + 1; 754 #ifdef DEBUG 755 printf("init: copying out path `%s' %d\n", path, i); 756 #else 757 if (boothowto & RB_ASKNAME || path != initpaths[0]) 758 printf("init: trying %s\n", path); 759 #endif 760 arg0 = STACK_ALLOC(ucp, i); 761 ucp = STACK_MAX(arg0, i); 762 (void)copyout((caddr_t)path, arg0, i); 763 764 /* 765 * Move out the arg pointers. 766 */ 767 ucp = (caddr_t)STACK_ALIGN(ucp, ALIGNBYTES); 768 uap = (char **)STACK_ALLOC(ucp, sizeof(char *) * 3); 769 SCARG(&args, path) = arg0; 770 SCARG(&args, argp) = uap; 771 SCARG(&args, envp) = NULL; 772 slash = strrchr(path, '/'); 773 if (slash) 774 (void)suword((caddr_t)uap++, 775 (long)arg0 + (slash + 1 - path)); 776 else 777 (void)suword((caddr_t)uap++, (long)arg0); 778 if (options != 0) 779 (void)suword((caddr_t)uap++, (long)arg1); 780 (void)suword((caddr_t)uap++, 0); /* terminator */ 781 782 /* 783 * Now try to exec the program. If can't for any reason 784 * other than it doesn't exist, complain. 785 */ 786 error = sys_execve(LIST_FIRST(&p->p_lwps), &args, retval); 787 if (error == 0 || error == EJUSTRETURN) { 788 KERNEL_PROC_UNLOCK(l); 789 return; 790 } 791 printf("exec %s: error %d\n", path, error); 792 } 793 printf("init: not found\n"); 794 panic("no init"); 795 } 796
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