init_main.c revision 1.227
1 /* $NetBSD: init_main.c,v 1.227 2003/11/14 07:13:25 jonathan 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 1.227 2003/11/14 07:13:25 jonathan 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 87 #include "opencrypto.h" 88 #include "rnd.h" 89 90 #include <sys/param.h> 91 #include <sys/acct.h> 92 #include <sys/filedesc.h> 93 #include <sys/file.h> 94 #include <sys/errno.h> 95 #include <sys/callout.h> 96 #include <sys/kernel.h> 97 #include <sys/mount.h> 98 #include <sys/proc.h> 99 #include <sys/kthread.h> 100 #include <sys/resourcevar.h> 101 #include <sys/signalvar.h> 102 #include <sys/systm.h> 103 #include <sys/vnode.h> 104 #include <sys/tty.h> 105 #include <sys/conf.h> 106 #include <sys/disklabel.h> 107 #include <sys/buf.h> 108 #include <sys/device.h> 109 #include <sys/disk.h> 110 #include <sys/exec.h> 111 #include <sys/socketvar.h> 112 #include <sys/protosw.h> 113 #include <sys/reboot.h> 114 #include <sys/user.h> 115 #include <sys/sysctl.h> 116 #include <sys/event.h> 117 #include <sys/mbuf.h> 118 #ifdef FAST_IPSEC 119 #include <netipsec/ipsec.h> 120 #endif 121 #ifdef SYSVSHM 122 #include <sys/shm.h> 123 #endif 124 #ifdef SYSVSEM 125 #include <sys/sem.h> 126 #endif 127 #ifdef SYSVMSG 128 #include <sys/msg.h> 129 #endif 130 #ifdef P1003_1B_SEMAPHORE 131 #include <sys/ksem.h> 132 #endif 133 #ifdef SYSTRACE 134 #include <sys/systrace.h> 135 #endif 136 #include <sys/domain.h> 137 #include <sys/namei.h> 138 #if NOPENCRYPTO > 0 139 #include <opencrypto/cryptodev.h> /* XXX really the framework */ 140 #endif 141 #if NRND > 0 142 #include <sys/rnd.h> 143 #endif 144 #ifndef PIPE_SOCKETPAIR 145 #include <sys/pipe.h> 146 #endif 147 #ifdef LKM 148 #include <sys/lkm.h> 149 #endif 150 151 #include <sys/syscall.h> 152 #include <sys/sa.h> 153 #include <sys/syscallargs.h> 154 155 #include <ufs/ufs/quota.h> 156 157 #include <miscfs/genfs/genfs.h> 158 #include <miscfs/syncfs/syncfs.h> 159 160 #include <machine/cpu.h> 161 162 #include <uvm/uvm.h> 163 164 #include <dev/cons.h> 165 166 #include <net/if.h> 167 #include <net/raw_cb.h> 168 169 const char copyright[] = 170 "Copyright (c) 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003\n" 171 " The NetBSD Foundation, Inc. All rights reserved.\n" 172 "Copyright (c) 1982, 1986, 1989, 1991, 1993\n" 173 " The Regents of the University of California. All rights reserved.\n" 174 "\n"; 175 176 /* Components of the first process -- never freed. */ 177 struct session session0; 178 struct pgrp pgrp0; 179 struct proc proc0; 180 struct lwp lwp0; 181 struct pcred cred0; 182 struct filedesc0 filedesc0; 183 struct cwdinfo cwdi0; 184 struct plimit limit0; 185 struct pstats pstat0; 186 struct vmspace vmspace0; 187 struct sigacts sigacts0; 188 #ifndef curlwp 189 struct lwp *curlwp = &lwp0; 190 #endif 191 struct proc *initproc; 192 193 int nofile = NOFILE; 194 int maxuprc = MAXUPRC; 195 int cmask = CMASK; 196 extern struct user *proc0paddr; 197 198 struct vnode *rootvp, *swapdev_vp; 199 int boothowto; 200 int cold = 1; /* still working on startup */ 201 struct timeval boottime; 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 * Attempt to find console and initialize 246 * in case of early panic or other messages. 247 */ 248 consinit(); 249 printf("%s", copyright); 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 /* 262 * Initialize mbuf's. Do this now because we might attempt to 263 * allocate mbufs or mbuf clusters during autoconfiguration. 264 */ 265 mbinit(); 266 267 /* Initialize kqueues. */ 268 kqueue_init(); 269 270 /* Initialize sockets. */ 271 soinit(); 272 273 /* 274 * The following things must be done before autoconfiguration. 275 */ 276 evcnt_init(); /* initialize event counters */ 277 disk_init(); /* initialize disk list */ 278 tty_init(); /* initialize tty list */ 279 #if NRND > 0 280 rnd_init(); /* initialize RNG */ 281 #endif 282 #if NOPENCRYPTO > 0 283 /* Initialize crypto subsystem before configuring crypto hardware. */ 284 (void)crypto_init(); 285 #endif 286 /* Initialize the sysctl subsystem. */ 287 sysctl_init(); 288 289 /* 290 * Initialize process and pgrp structures. 291 */ 292 procinit(); 293 294 #ifdef LKM 295 /* Initialize the LKM system. */ 296 lkm_init(); 297 #endif 298 299 /* 300 * Create process 0 (the swapper). 301 */ 302 p = &proc0; 303 proc0_insert(p, l, &pgrp0, &session0); 304 305 /* 306 * Set P_NOCLDWAIT so that kernel threads are reparented to 307 * init(8) when they exit. init(8) can easily wait them out 308 * for us. 309 */ 310 p->p_flag = P_SYSTEM | P_NOCLDWAIT; 311 p->p_stat = SACTIVE; 312 p->p_nice = NZERO; 313 p->p_emul = &emul_netbsd; 314 #ifdef __HAVE_SYSCALL_INTERN 315 (*p->p_emul->e_syscall_intern)(p); 316 #endif 317 strncpy(p->p_comm, "swapper", MAXCOMLEN); 318 319 l->l_flag = L_INMEM; 320 l->l_stat = LSONPROC; 321 p->p_nrlwps = 1; 322 323 callout_init(&l->l_tsleep_ch); 324 325 /* Create credentials. */ 326 cred0.p_refcnt = 1; 327 p->p_cred = &cred0; 328 p->p_ucred = crget(); 329 p->p_ucred->cr_ngroups = 1; /* group 0 */ 330 331 /* Create the file descriptor table. */ 332 finit(); 333 p->p_fd = &filedesc0.fd_fd; 334 fdinit1(&filedesc0); 335 336 /* Create the CWD info. */ 337 p->p_cwdi = &cwdi0; 338 cwdi0.cwdi_cmask = cmask; 339 cwdi0.cwdi_refcnt = 1; 340 341 /* Create the limits structures. */ 342 p->p_limit = &limit0; 343 for (i = 0; i < sizeof(p->p_rlimit)/sizeof(p->p_rlimit[0]); i++) 344 limit0.pl_rlimit[i].rlim_cur = 345 limit0.pl_rlimit[i].rlim_max = RLIM_INFINITY; 346 347 limit0.pl_rlimit[RLIMIT_NOFILE].rlim_max = maxfiles; 348 limit0.pl_rlimit[RLIMIT_NOFILE].rlim_cur = 349 maxfiles < nofile ? maxfiles : nofile; 350 351 limit0.pl_rlimit[RLIMIT_NPROC].rlim_max = maxproc; 352 limit0.pl_rlimit[RLIMIT_NPROC].rlim_cur = 353 maxproc < maxuprc ? maxproc : maxuprc; 354 355 lim = ptoa(uvmexp.free); 356 limit0.pl_rlimit[RLIMIT_RSS].rlim_max = lim; 357 limit0.pl_rlimit[RLIMIT_MEMLOCK].rlim_max = lim; 358 limit0.pl_rlimit[RLIMIT_MEMLOCK].rlim_cur = lim / 3; 359 limit0.pl_corename = defcorename; 360 limit0.p_refcnt = 1; 361 362 /* 363 * Initialize proc0's vmspace, which uses the kernel pmap. 364 * All kernel processes (which never have user space mappings) 365 * share proc0's vmspace, and thus, the kernel pmap. 366 */ 367 uvmspace_init(&vmspace0, pmap_kernel(), round_page(VM_MIN_ADDRESS), 368 trunc_page(VM_MAX_ADDRESS)); 369 p->p_vmspace = &vmspace0; 370 371 l->l_addr = proc0paddr; /* XXX */ 372 373 p->p_stats = &pstat0; 374 375 /* 376 * Charge root for one process. 377 */ 378 (void)chgproccnt(0, 1); 379 380 rqinit(); 381 382 /* Configure virtual memory system, set vm rlimits. */ 383 uvm_init_limits(p); 384 385 /* Initialize the file systems. */ 386 #if defined(NFSSERVER) || defined(NFS) 387 nfs_init(); /* initialize server/shared data */ 388 #endif 389 #ifdef NVNODE_IMPLICIT 390 /* 391 * If maximum number of vnodes in namei vnode cache is not explicitly 392 * defined in kernel config, adjust the number such as we use roughly 393 * 0.5% of memory for vnode cache (but not less than NVNODE vnodes). 394 */ 395 usevnodes = (ptoa((unsigned)physmem) / 200) / sizeof(struct vnode); 396 if (usevnodes > desiredvnodes) 397 desiredvnodes = usevnodes; 398 #endif 399 vfsinit(); 400 401 /* Configure the system hardware. This will enable interrupts. */ 402 configure(); 403 404 ubc_init(); /* must be after autoconfig */ 405 406 /* Lock the kernel on behalf of proc0. */ 407 KERNEL_PROC_LOCK(l); 408 409 #ifdef SYSVSHM 410 /* Initialize System V style shared memory. */ 411 shminit(); 412 #endif 413 414 #ifdef SYSVSEM 415 /* Initialize System V style semaphores. */ 416 seminit(); 417 #endif 418 419 #ifdef SYSVMSG 420 /* Initialize System V style message queues. */ 421 msginit(); 422 #endif 423 424 425 #ifdef P1003_1B_SEMAPHORE 426 /* Initialize posix semaphores */ 427 ksem_init(); 428 #endif 429 /* Attach pseudo-devices. */ 430 for (pdev = pdevinit; pdev->pdev_attach != NULL; pdev++) 431 (*pdev->pdev_attach)(pdev->pdev_count); 432 433 #ifdef FAST_IPSEC 434 /* Attach network crypto subsystem */ 435 ipsec_attach(); 436 #endif 437 438 /* 439 * Initialize protocols. Block reception of incoming packets 440 * until everything is ready. 441 */ 442 s = splnet(); 443 ifinit(); 444 domaininit(); 445 if_attachdomain(); 446 splx(s); 447 448 #ifdef GPROF 449 /* Initialize kernel profiling. */ 450 kmstartup(); 451 #endif 452 453 /* Initialize system accouting. */ 454 acct_init(); 455 456 #ifdef SYSTRACE 457 systrace_init(); 458 #endif 459 /* 460 * Initialize signal-related data structures, and signal state 461 * for proc0. 462 */ 463 signal_init(); 464 p->p_sigacts = &sigacts0; 465 siginit(p); 466 467 /* Kick off timeout driven events by calling first time. */ 468 schedcpu(NULL); 469 470 /* 471 * Create process 1 (init(8)). We do this now, as Unix has 472 * historically had init be process 1, and changing this would 473 * probably upset a lot of people. 474 * 475 * Note that process 1 won't immediately exec init(8), but will 476 * wait for us to inform it that the root file system has been 477 * mounted. 478 */ 479 if (fork1(l, 0, SIGCHLD, NULL, 0, start_init, NULL, NULL, &initproc)) 480 panic("fork init"); 481 482 /* 483 * Create any kernel threads who's creation was deferred because 484 * initproc had not yet been created. 485 */ 486 kthread_run_deferred_queue(); 487 488 /* 489 * Now that device driver threads have been created, wait for 490 * them to finish any deferred autoconfiguration. Note we don't 491 * need to lock this semaphore, since we haven't booted any 492 * secondary processors, yet. 493 */ 494 while (config_pending) 495 (void) tsleep((void *)&config_pending, PWAIT, "cfpend", 0); 496 497 /* 498 * Finalize configuration now that all real devices have been 499 * found. This needs to be done before the root device is 500 * selected, since finalization may create the root device. 501 */ 502 config_finalize(); 503 504 /* 505 * Now that autoconfiguration has completed, we can determine 506 * the root and dump devices. 507 */ 508 cpu_rootconf(); 509 cpu_dumpconf(); 510 511 /* Mount the root file system. */ 512 do { 513 domountroothook(); 514 if ((error = vfs_mountroot())) { 515 printf("cannot mount root, error = %d\n", error); 516 boothowto |= RB_ASKNAME; 517 setroot(root_device, 518 (rootdev != NODEV) ? DISKPART(rootdev) : 0); 519 } 520 } while (error != 0); 521 mountroothook_destroy(); 522 523 CIRCLEQ_FIRST(&mountlist)->mnt_flag |= MNT_ROOTFS; 524 CIRCLEQ_FIRST(&mountlist)->mnt_op->vfs_refcount++; 525 526 /* 527 * Get the vnode for '/'. Set filedesc0.fd_fd.fd_cdir to 528 * reference it. 529 */ 530 if (VFS_ROOT(CIRCLEQ_FIRST(&mountlist), &rootvnode)) 531 panic("cannot find root vnode"); 532 cwdi0.cwdi_cdir = rootvnode; 533 VREF(cwdi0.cwdi_cdir); 534 VOP_UNLOCK(rootvnode, 0); 535 cwdi0.cwdi_rdir = NULL; 536 537 /* 538 * Now that root is mounted, we can fixup initproc's CWD 539 * info. All other processes are kthreads, which merely 540 * share proc0's CWD info. 541 */ 542 initproc->p_cwdi->cwdi_cdir = rootvnode; 543 VREF(initproc->p_cwdi->cwdi_cdir); 544 initproc->p_cwdi->cwdi_rdir = NULL; 545 546 /* 547 * Now can look at time, having had a chance to verify the time 548 * from the file system. Reset p->p_rtime as it may have been 549 * munched in mi_switch() after the time got set. 550 */ 551 proclist_lock_read(); 552 s = splsched(); 553 LIST_FOREACH(p, &allproc, p_list) { 554 p->p_stats->p_start = mono_time = boottime = time; 555 LIST_FOREACH(l, &p->p_lwps, l_sibling) { 556 if (l->l_cpu != NULL) 557 l->l_cpu->ci_schedstate.spc_runtime = time; 558 } 559 p->p_rtime.tv_sec = p->p_rtime.tv_usec = 0; 560 } 561 splx(s); 562 proclist_unlock_read(); 563 564 /* Create the pageout daemon kernel thread. */ 565 uvm_swap_init(); 566 if (kthread_create1(uvm_pageout, NULL, NULL, "pagedaemon")) 567 panic("fork pagedaemon"); 568 569 /* Create the process reaper kernel thread. */ 570 if (kthread_create1(reaper, NULL, NULL, "reaper")) 571 panic("fork reaper"); 572 573 /* Create the filesystem syncer kernel thread. */ 574 if (kthread_create1(sched_sync, NULL, NULL, "ioflush")) 575 panic("fork syncer"); 576 577 /* Create the aiodone daemon kernel thread. */ 578 if (kthread_create1(uvm_aiodone_daemon, NULL, &uvm.aiodoned_proc, 579 "aiodoned")) 580 panic("fork aiodoned"); 581 582 #if defined(MULTIPROCESSOR) 583 /* Boot the secondary processors. */ 584 cpu_boot_secondary_processors(); 585 #endif 586 587 /* Initialize exec structures */ 588 exec_init(1); 589 590 #ifndef PIPE_SOCKETPAIR 591 /* Initialize pipe structures */ 592 pipe_init(); 593 #endif 594 595 /* 596 * Okay, now we can let init(8) exec! It's off to userland! 597 */ 598 start_init_exec = 1; 599 wakeup((void *)&start_init_exec); 600 601 /* The scheduler is an infinite loop. */ 602 uvm_scheduler(); 603 /* NOTREACHED */ 604 } 605 606 static void 607 check_console(struct proc *p) 608 { 609 struct nameidata nd; 610 int error; 611 612 NDINIT(&nd, LOOKUP, FOLLOW, UIO_SYSSPACE, "/dev/console", p); 613 error = namei(&nd); 614 if (error == 0) 615 vrele(nd.ni_vp); 616 else if (error == ENOENT) 617 printf("warning: no /dev/console\n"); 618 else 619 printf("warning: lookup /dev/console: error %d\n", error); 620 } 621 622 /* 623 * List of paths to try when searching for "init". 624 */ 625 static const char *initpaths[] = { 626 "/sbin/init", 627 "/sbin/oinit", 628 "/sbin/init.bak", 629 NULL, 630 }; 631 632 /* 633 * Start the initial user process; try exec'ing each pathname in "initpaths". 634 * The program is invoked with one argument containing the boot flags. 635 */ 636 static void 637 start_init(void *arg) 638 { 639 struct lwp *l = arg; 640 struct proc *p = l->l_proc; 641 vaddr_t addr; 642 struct sys_execve_args /* { 643 syscallarg(const char *) path; 644 syscallarg(char * const *) argp; 645 syscallarg(char * const *) envp; 646 } */ args; 647 int options, i, error; 648 register_t retval[2]; 649 char flags[4], *flagsp; 650 const char *path, *slash; 651 char *ucp, **uap, *arg0, *arg1 = NULL; 652 char ipath[129]; 653 int ipx, len; 654 655 /* 656 * Now in process 1. 657 */ 658 strncpy(p->p_comm, "init", MAXCOMLEN); 659 660 /* 661 * Wait for main() to tell us that it's safe to exec. 662 */ 663 while (start_init_exec == 0) 664 (void) tsleep((void *)&start_init_exec, PWAIT, "initexec", 0); 665 666 /* 667 * This is not the right way to do this. We really should 668 * hand-craft a descriptor onto /dev/console to hand to init, 669 * but that's a _lot_ more work, and the benefit from this easy 670 * hack makes up for the "good is the enemy of the best" effect. 671 */ 672 check_console(p); 673 674 /* 675 * Need just enough stack to hold the faked-up "execve()" arguments. 676 */ 677 addr = (vaddr_t)STACK_ALLOC(USRSTACK, PAGE_SIZE); 678 if (uvm_map(&p->p_vmspace->vm_map, &addr, PAGE_SIZE, 679 NULL, UVM_UNKNOWN_OFFSET, 0, 680 UVM_MAPFLAG(UVM_PROT_ALL, UVM_PROT_ALL, UVM_INH_COPY, 681 UVM_ADV_NORMAL, 682 UVM_FLAG_FIXED|UVM_FLAG_OVERLAY|UVM_FLAG_COPYONW)) != 0) 683 panic("init: couldn't allocate argument space"); 684 p->p_vmspace->vm_maxsaddr = (caddr_t)STACK_MAX(addr, PAGE_SIZE); 685 686 ipx = 0; 687 while (1) { 688 if (boothowto & RB_ASKNAME) { 689 printf("init path"); 690 if (initpaths[ipx]) 691 printf(" (default %s)", initpaths[ipx]); 692 printf(": "); 693 len = cngetsn(ipath, sizeof(ipath)-1); 694 if (len == 0) { 695 if (initpaths[ipx]) 696 path = initpaths[ipx++]; 697 else 698 continue; 699 } else { 700 ipath[len] = '\0'; 701 path = ipath; 702 } 703 } else { 704 if ((path = initpaths[ipx++]) == NULL) 705 break; 706 } 707 708 ucp = (char *)USRSTACK; 709 710 /* 711 * Construct the boot flag argument. 712 */ 713 flagsp = flags; 714 *flagsp++ = '-'; 715 options = 0; 716 717 if (boothowto & RB_SINGLE) { 718 *flagsp++ = 's'; 719 options = 1; 720 } 721 #ifdef notyet 722 if (boothowto & RB_FASTBOOT) { 723 *flagsp++ = 'f'; 724 options = 1; 725 } 726 #endif 727 728 /* 729 * Move out the flags (arg 1), if necessary. 730 */ 731 if (options != 0) { 732 *flagsp++ = '\0'; 733 i = flagsp - flags; 734 #ifdef DEBUG 735 printf("init: copying out flags `%s' %d\n", flags, i); 736 #endif 737 arg1 = STACK_ALLOC(ucp, i); 738 ucp = STACK_MAX(arg1, i); 739 (void)copyout((caddr_t)flags, arg1, i); 740 } 741 742 /* 743 * Move out the file name (also arg 0). 744 */ 745 i = strlen(path) + 1; 746 #ifdef DEBUG 747 printf("init: copying out path `%s' %d\n", path, i); 748 #else 749 if (boothowto & RB_ASKNAME || path != initpaths[0]) 750 printf("init: trying %s\n", path); 751 #endif 752 arg0 = STACK_ALLOC(ucp, i); 753 ucp = STACK_MAX(arg0, i); 754 (void)copyout((caddr_t)path, arg0, i); 755 756 /* 757 * Move out the arg pointers. 758 */ 759 ucp = (caddr_t)STACK_ALIGN(ucp, ALIGNBYTES); 760 uap = (char **)STACK_ALLOC(ucp, sizeof(char *) * 3); 761 SCARG(&args, path) = arg0; 762 SCARG(&args, argp) = uap; 763 SCARG(&args, envp) = NULL; 764 slash = strrchr(path, '/'); 765 if (slash) 766 (void)suword((caddr_t)uap++, 767 (long)arg0 + (slash + 1 - path)); 768 else 769 (void)suword((caddr_t)uap++, (long)arg0); 770 if (options != 0) 771 (void)suword((caddr_t)uap++, (long)arg1); 772 (void)suword((caddr_t)uap++, 0); /* terminator */ 773 774 /* 775 * Now try to exec the program. If can't for any reason 776 * other than it doesn't exist, complain. 777 */ 778 error = sys_execve(LIST_FIRST(&p->p_lwps), &args, retval); 779 if (error == 0 || error == EJUSTRETURN) { 780 KERNEL_PROC_UNLOCK(l); 781 return; 782 } 783 printf("exec %s: error %d\n", path, error); 784 } 785 printf("init: not found\n"); 786 panic("no init"); 787 } 788
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