1 /* $NetBSD: init_main.c,v 1.208 2002/10/01 18:11:58 thorpej Exp $ */ 2 3 /* 4 * Copyright (c) 1995 Christopher G. Demetriou. All rights reserved. 5 * Copyright (c) 1982, 1986, 1989, 1991, 1992, 1993 6 * The Regents of the University of California. All rights reserved. 7 * (c) UNIX System Laboratories, Inc. 8 * All or some portions of this file are derived from material licensed 9 * to the University of California by American Telephone and Telegraph 10 * Co. or Unix System Laboratories, Inc. and are reproduced herein with 11 * the permission of UNIX System Laboratories, Inc. 12 * 13 * Redistribution and use in source and binary forms, with or without 14 * modification, are permitted provided that the following conditions 15 * are met: 16 * 1. Redistributions of source code must retain the above copyright 17 * notice, this list of conditions and the following disclaimer. 18 * 2. Redistributions in binary form must reproduce the above copyright 19 * notice, this list of conditions and the following disclaimer in the 20 * documentation and/or other materials provided with the distribution. 21 * 3. All advertising materials mentioning features or use of this software 22 * must display the following acknowledgement: 23 * This product includes software developed by the University of 24 * California, Berkeley and its contributors. 25 * 4. Neither the name of the University nor the names of its contributors 26 * may be used to endorse or promote products derived from this software 27 * without specific prior written permission. 28 * 29 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 30 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 31 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 32 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 33 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 34 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 35 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 36 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 37 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 38 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 39 * SUCH DAMAGE. 40 * 41 * @(#)init_main.c 8.16 (Berkeley) 5/14/95 42 */ 43 44 #include <sys/cdefs.h> 45 __KERNEL_RCSID(0, "$NetBSD: init_main.c,v 1.208 2002/10/01 18:11:58 thorpej Exp $"); 46 47 #include "fs_nfs.h" 48 #include "opt_nfsserver.h" 49 #include "opt_sysv.h" 50 #include "opt_maxuprc.h" 51 #include "opt_multiprocessor.h" 52 #include "opt_pipe.h" 53 #include "opt_syscall_debug.h" 54 #include "opt_systrace.h" 55 56 #include "rnd.h" 57 58 #include <sys/param.h> 59 #include <sys/acct.h> 60 #include <sys/filedesc.h> 61 #include <sys/file.h> 62 #include <sys/errno.h> 63 #include <sys/callout.h> 64 #include <sys/kernel.h> 65 #include <sys/mount.h> 66 #include <sys/proc.h> 67 #include <sys/kthread.h> 68 #include <sys/resourcevar.h> 69 #include <sys/signalvar.h> 70 #include <sys/systm.h> 71 #include <sys/vnode.h> 72 #include <sys/tty.h> 73 #include <sys/conf.h> 74 #include <sys/disklabel.h> 75 #include <sys/buf.h> 76 #include <sys/device.h> 77 #include <sys/disk.h> 78 #include <sys/exec.h> 79 #include <sys/socketvar.h> 80 #include <sys/protosw.h> 81 #include <sys/reboot.h> 82 #include <sys/user.h> 83 #include <sys/sysctl.h> 84 #ifdef SYSVSHM 85 #include <sys/shm.h> 86 #endif 87 #ifdef SYSVSEM 88 #include <sys/sem.h> 89 #endif 90 #ifdef SYSVMSG 91 #include <sys/msg.h> 92 #endif 93 #ifdef SYSTRACE 94 #include <sys/systrace.h> 95 #endif 96 #include <sys/domain.h> 97 #include <sys/mbuf.h> 98 #include <sys/namei.h> 99 #if NRND > 0 100 #include <sys/rnd.h> 101 #endif 102 #ifndef PIPE_SOCKETPAIR 103 #include <sys/pipe.h> 104 #endif 105 106 #include <sys/syscall.h> 107 #include <sys/syscallargs.h> 108 109 #include <ufs/ufs/quota.h> 110 111 #include <miscfs/genfs/genfs.h> 112 #include <miscfs/syncfs/syncfs.h> 113 114 #include <machine/cpu.h> 115 116 #include <uvm/uvm.h> 117 118 #include <dev/cons.h> 119 120 #include <net/if.h> 121 #include <net/raw_cb.h> 122 123 const char copyright[] = 124 "Copyright (c) 1996, 1997, 1998, 1999, 2000, 2001, 2002\n" 125 " The NetBSD Foundation, Inc. All rights reserved.\n" 126 "Copyright (c) 1982, 1986, 1989, 1991, 1993\n" 127 " The Regents of the University of California. All rights reserved.\n" 128 "\n"; 129 130 /* Components of the first process -- never freed. */ 131 struct session session0; 132 struct pgrp pgrp0; 133 struct proc proc0; 134 struct pcred cred0; 135 struct filedesc0 filedesc0; 136 struct cwdinfo cwdi0; 137 struct plimit limit0; 138 struct vmspace vmspace0; 139 struct sigacts sigacts0; 140 #ifndef curproc 141 struct proc *curproc = &proc0; 142 #endif 143 struct proc *initproc; 144 145 int cmask = CMASK; 146 extern struct user *proc0paddr; 147 148 struct vnode *rootvp, *swapdev_vp; 149 int boothowto; 150 int cold = 1; /* still working on startup */ 151 struct timeval boottime; 152 153 __volatile int start_init_exec; /* semaphore for start_init() */ 154 155 static void check_console(struct proc *p); 156 static void start_init(void *); 157 void main(void); 158 159 extern const struct emul emul_netbsd; /* defined in kern_exec.c */ 160 161 /* 162 * System startup; initialize the world, create process 0, mount root 163 * filesystem, and fork to create init and pagedaemon. Most of the 164 * hard work is done in the lower-level initialization routines including 165 * startup(), which does memory initialization and autoconfiguration. 166 */ 167 void 168 main(void) 169 { 170 struct proc *p; 171 struct pdevinit *pdev; 172 int s, error; 173 u_int i; 174 rlim_t lim; 175 extern struct pdevinit pdevinit[]; 176 extern void schedcpu(void *); 177 #if defined(NFSSERVER) || defined(NFS) 178 extern void nfs_init(void); 179 #endif 180 #ifdef NVNODE_IMPLICIT 181 int usevnodes; 182 #endif 183 184 /* 185 * Initialize the current process pointer (curproc) before 186 * any possible traps/probes to simplify trap processing. 187 */ 188 simple_lock_init(&proc0.p_raslock); 189 p = &proc0; 190 curproc = p; 191 p->p_cpu = curcpu(); 192 /* 193 * Attempt to find console and initialize 194 * in case of early panic or other messages. 195 */ 196 consinit(); 197 printf("%s", copyright); 198 199 KERNEL_LOCK_INIT(); 200 201 uvm_init(); 202 203 /* Do machine-dependent initialization. */ 204 cpu_startup(); 205 206 /* Initialize callouts. */ 207 callout_startup(); 208 209 /* 210 * Initialize mbuf's. Do this now because we might attempt to 211 * allocate mbufs or mbuf clusters during autoconfiguration. 212 */ 213 mbinit(); 214 215 /* Initialize sockets. */ 216 soinit(); 217 218 /* 219 * The following 3 things must be done before autoconfiguration. 220 */ 221 disk_init(); /* initialize disk list */ 222 tty_init(); /* initialize tty list */ 223 #if NRND > 0 224 rnd_init(); /* initialize RNG */ 225 #endif 226 227 /* Initialize the sysctl subsystem. */ 228 sysctl_init(); 229 230 /* 231 * Initialize process and pgrp structures. 232 */ 233 procinit(); 234 235 /* 236 * Create process 0 (the swapper). 237 */ 238 s = proclist_lock_write(); 239 LIST_INSERT_HEAD(&allproc, p, p_list); 240 LIST_INSERT_HEAD(PIDHASH(p->p_pid), p, p_hash); 241 proclist_unlock_write(s); 242 243 p->p_pgrp = &pgrp0; 244 LIST_INSERT_HEAD(PGRPHASH(0), &pgrp0, pg_hash); 245 LIST_INIT(&pgrp0.pg_members); 246 LIST_INSERT_HEAD(&pgrp0.pg_members, p, p_pglist); 247 248 pgrp0.pg_session = &session0; 249 session0.s_count = 1; 250 session0.s_sid = p->p_pid; 251 session0.s_leader = p; 252 253 /* 254 * Set P_NOCLDWAIT so that kernel threads are reparented to 255 * init(8) when they exit. init(8) can easily wait them out 256 * for us. 257 */ 258 p->p_flag = P_INMEM | P_SYSTEM | P_NOCLDWAIT; 259 p->p_stat = SONPROC; 260 p->p_nice = NZERO; 261 p->p_emul = &emul_netbsd; 262 #ifdef __HAVE_SYSCALL_INTERN 263 (*p->p_emul->e_syscall_intern)(p); 264 #endif 265 strncpy(p->p_comm, "swapper", MAXCOMLEN); 266 267 callout_init(&p->p_realit_ch); 268 callout_init(&p->p_tsleep_ch); 269 270 /* Create credentials. */ 271 cred0.p_refcnt = 1; 272 p->p_cred = &cred0; 273 p->p_ucred = crget(); 274 p->p_ucred->cr_ngroups = 1; /* group 0 */ 275 276 /* Create the file descriptor table. */ 277 finit(); 278 p->p_fd = &filedesc0.fd_fd; 279 fdinit1(&filedesc0); 280 281 /* Create the CWD info. */ 282 p->p_cwdi = &cwdi0; 283 cwdi0.cwdi_cmask = cmask; 284 cwdi0.cwdi_refcnt = 1; 285 286 /* Create the limits structures. */ 287 p->p_limit = &limit0; 288 for (i = 0; i < sizeof(p->p_rlimit)/sizeof(p->p_rlimit[0]); i++) 289 limit0.pl_rlimit[i].rlim_cur = 290 limit0.pl_rlimit[i].rlim_max = RLIM_INFINITY; 291 292 limit0.pl_rlimit[RLIMIT_NOFILE].rlim_max = maxfiles; 293 limit0.pl_rlimit[RLIMIT_NOFILE].rlim_cur = 294 maxfiles < NOFILE ? maxfiles : NOFILE; 295 296 limit0.pl_rlimit[RLIMIT_NPROC].rlim_max = maxproc; 297 limit0.pl_rlimit[RLIMIT_NPROC].rlim_cur = 298 maxproc < MAXUPRC ? maxproc : MAXUPRC; 299 300 lim = ptoa(uvmexp.free); 301 limit0.pl_rlimit[RLIMIT_RSS].rlim_max = lim; 302 limit0.pl_rlimit[RLIMIT_MEMLOCK].rlim_max = lim; 303 limit0.pl_rlimit[RLIMIT_MEMLOCK].rlim_cur = lim / 3; 304 limit0.pl_corename = defcorename; 305 limit0.p_refcnt = 1; 306 307 /* 308 * Initialize proc0's vmspace, which uses the kernel pmap. 309 * All kernel processes (which never have user space mappings) 310 * share proc0's vmspace, and thus, the kernel pmap. 311 */ 312 uvmspace_init(&vmspace0, pmap_kernel(), round_page(VM_MIN_ADDRESS), 313 trunc_page(VM_MAX_ADDRESS)); 314 p->p_vmspace = &vmspace0; 315 316 p->p_addr = proc0paddr; /* XXX */ 317 318 /* 319 * We continue to place resource usage info in the 320 * user struct so they're pageable. 321 */ 322 p->p_stats = &p->p_addr->u_stats; 323 324 /* 325 * Charge root for one process. 326 */ 327 (void)chgproccnt(0, 1); 328 329 rqinit(); 330 331 /* Configure virtual memory system, set vm rlimits. */ 332 uvm_init_limits(p); 333 334 /* Initialize the file systems. */ 335 #if defined(NFSSERVER) || defined(NFS) 336 nfs_init(); /* initialize server/shared data */ 337 #endif 338 #ifdef NVNODE_IMPLICIT 339 /* 340 * If maximum number of vnodes in namei vnode cache is not explicitly 341 * defined in kernel config, adjust the number such as we use roughly 342 * 0.5% of memory for vnode cache (but not less than NVNODE vnodes). 343 */ 344 usevnodes = (ptoa((unsigned)physmem) / 200) / sizeof(struct vnode); 345 if (usevnodes > desiredvnodes) 346 desiredvnodes = usevnodes; 347 #endif 348 vfsinit(); 349 350 /* Configure the system hardware. This will enable interrupts. */ 351 configure(); 352 353 ubc_init(); /* must be after autoconfig */ 354 355 /* Lock the kernel on behalf of proc0. */ 356 KERNEL_PROC_LOCK(p); 357 358 #ifdef SYSVSHM 359 /* Initialize System V style shared memory. */ 360 shminit(); 361 #endif 362 363 #ifdef SYSVSEM 364 /* Initialize System V style semaphores. */ 365 seminit(); 366 #endif 367 368 #ifdef SYSVMSG 369 /* Initialize System V style message queues. */ 370 msginit(); 371 #endif 372 373 /* Attach pseudo-devices. */ 374 for (pdev = pdevinit; pdev->pdev_attach != NULL; pdev++) 375 (*pdev->pdev_attach)(pdev->pdev_count); 376 377 /* 378 * Initialize protocols. Block reception of incoming packets 379 * until everything is ready. 380 */ 381 s = splnet(); 382 ifinit(); 383 domaininit(); 384 if_attachdomain(); 385 splx(s); 386 387 #ifdef GPROF 388 /* Initialize kernel profiling. */ 389 kmstartup(); 390 #endif 391 392 /* Initialize system accouting. */ 393 acct_init(); 394 395 #ifdef SYSTRACE 396 systrace_init(); 397 #endif 398 /* 399 * Initialize signal-related data structures, and signal state 400 * for proc0. 401 */ 402 signal_init(); 403 p->p_sigacts = &sigacts0; 404 siginit(p); 405 406 /* Kick off timeout driven events by calling first time. */ 407 schedcpu(NULL); 408 409 /* 410 * Create process 1 (init(8)). We do this now, as Unix has 411 * historically had init be process 1, and changing this would 412 * probably upset a lot of people. 413 * 414 * Note that process 1 won't immediately exec init(8), but will 415 * wait for us to inform it that the root file system has been 416 * mounted. 417 */ 418 if (fork1(p, 0, SIGCHLD, NULL, 0, start_init, NULL, NULL, &initproc)) 419 panic("fork init"); 420 421 /* 422 * Create any kernel threads who's creation was deferred because 423 * initproc had not yet been created. 424 */ 425 kthread_run_deferred_queue(); 426 427 /* 428 * Now that device driver threads have been created, wait for 429 * them to finish any deferred autoconfiguration. Note we don't 430 * need to lock this semaphore, since we haven't booted any 431 * secondary processors, yet. 432 */ 433 while (config_pending) 434 (void) tsleep((void *)&config_pending, PWAIT, "cfpend", 0); 435 436 /* 437 * Finalize configuration now that all real devices have been 438 * found. This needs to be done before the root device is 439 * selected, since finalization may create the root device. 440 */ 441 config_finalize(); 442 443 /* 444 * Now that autoconfiguration has completed, we can determine 445 * the root and dump devices. 446 */ 447 cpu_rootconf(); 448 cpu_dumpconf(); 449 450 /* Mount the root file system. */ 451 do { 452 domountroothook(); 453 if ((error = vfs_mountroot())) { 454 printf("cannot mount root, error = %d\n", error); 455 boothowto |= RB_ASKNAME; 456 setroot(root_device, 457 (rootdev != NODEV) ? DISKPART(rootdev) : 0); 458 } 459 } while (error != 0); 460 mountroothook_destroy(); 461 462 CIRCLEQ_FIRST(&mountlist)->mnt_flag |= MNT_ROOTFS; 463 CIRCLEQ_FIRST(&mountlist)->mnt_op->vfs_refcount++; 464 465 /* 466 * Get the vnode for '/'. Set filedesc0.fd_fd.fd_cdir to 467 * reference it. 468 */ 469 if (VFS_ROOT(CIRCLEQ_FIRST(&mountlist), &rootvnode)) 470 panic("cannot find root vnode"); 471 cwdi0.cwdi_cdir = rootvnode; 472 VREF(cwdi0.cwdi_cdir); 473 VOP_UNLOCK(rootvnode, 0); 474 cwdi0.cwdi_rdir = NULL; 475 476 /* 477 * Now that root is mounted, we can fixup initproc's CWD 478 * info. All other processes are kthreads, which merely 479 * share proc0's CWD info. 480 */ 481 initproc->p_cwdi->cwdi_cdir = rootvnode; 482 VREF(initproc->p_cwdi->cwdi_cdir); 483 initproc->p_cwdi->cwdi_rdir = NULL; 484 485 /* 486 * Now can look at time, having had a chance to verify the time 487 * from the file system. Reset p->p_rtime as it may have been 488 * munched in mi_switch() after the time got set. 489 */ 490 proclist_lock_read(); 491 s = splsched(); 492 for (p = LIST_FIRST(&allproc); p != NULL; 493 p = LIST_NEXT(p, p_list)) { 494 p->p_stats->p_start = mono_time = boottime = time; 495 if (p->p_cpu != NULL) 496 p->p_cpu->ci_schedstate.spc_runtime = time; 497 p->p_rtime.tv_sec = p->p_rtime.tv_usec = 0; 498 } 499 splx(s); 500 proclist_unlock_read(); 501 502 /* Create the pageout daemon kernel thread. */ 503 uvm_swap_init(); 504 if (kthread_create1(uvm_pageout, NULL, NULL, "pagedaemon")) 505 panic("fork pagedaemon"); 506 507 /* Create the process reaper kernel thread. */ 508 if (kthread_create1(reaper, NULL, NULL, "reaper")) 509 panic("fork reaper"); 510 511 /* Create the filesystem syncer kernel thread. */ 512 if (kthread_create1(sched_sync, NULL, NULL, "ioflush")) 513 panic("fork syncer"); 514 515 /* Create the aiodone daemon kernel thread. */ 516 if (kthread_create1(uvm_aiodone_daemon, NULL, NULL, "aiodoned")) 517 panic("fork aiodoned"); 518 519 #if defined(MULTIPROCESSOR) 520 /* Boot the secondary processors. */ 521 cpu_boot_secondary_processors(); 522 #endif 523 524 /* Initialize exec structures */ 525 exec_init(1); 526 527 #ifndef PIPE_SOCKETPAIR 528 /* Initialize pipe structures */ 529 pipe_init(); 530 #endif 531 532 /* 533 * Okay, now we can let init(8) exec! It's off to userland! 534 */ 535 start_init_exec = 1; 536 wakeup((void *)&start_init_exec); 537 538 /* The scheduler is an infinite loop. */ 539 uvm_scheduler(); 540 /* NOTREACHED */ 541 } 542 543 static void 544 check_console(struct proc *p) 545 { 546 struct nameidata nd; 547 int error; 548 549 NDINIT(&nd, LOOKUP, FOLLOW, UIO_SYSSPACE, "/dev/console", p); 550 error = namei(&nd); 551 if (error == 0) 552 vrele(nd.ni_vp); 553 else if (error == ENOENT) 554 printf("warning: no /dev/console\n"); 555 else 556 printf("warning: lookup /dev/console: error %d\n", error); 557 } 558 559 /* 560 * List of paths to try when searching for "init". 561 */ 562 static const char *initpaths[] = { 563 "/sbin/init", 564 "/sbin/oinit", 565 "/sbin/init.bak", 566 NULL, 567 }; 568 569 /* 570 * Start the initial user process; try exec'ing each pathname in "initpaths". 571 * The program is invoked with one argument containing the boot flags. 572 */ 573 static void 574 start_init(void *arg) 575 { 576 struct proc *p = arg; 577 vaddr_t addr; 578 struct sys_execve_args /* { 579 syscallarg(const char *) path; 580 syscallarg(char * const *) argp; 581 syscallarg(char * const *) envp; 582 } */ args; 583 int options, i, error; 584 register_t retval[2]; 585 char flags[4], *flagsp; 586 const char *path, *slash; 587 char *ucp, **uap, *arg0, *arg1 = NULL; 588 char ipath[129]; 589 int ipx, len; 590 591 /* 592 * Now in process 1. 593 */ 594 strncpy(p->p_comm, "init", MAXCOMLEN); 595 596 /* 597 * Wait for main() to tell us that it's safe to exec. 598 */ 599 while (start_init_exec == 0) 600 (void) tsleep((void *)&start_init_exec, PWAIT, "initexec", 0); 601 602 /* 603 * This is not the right way to do this. We really should 604 * hand-craft a descriptor onto /dev/console to hand to init, 605 * but that's a _lot_ more work, and the benefit from this easy 606 * hack makes up for the "good is the enemy of the best" effect. 607 */ 608 check_console(p); 609 610 /* 611 * Need just enough stack to hold the faked-up "execve()" arguments. 612 */ 613 addr = USRSTACK - PAGE_SIZE; 614 if (uvm_map(&p->p_vmspace->vm_map, &addr, PAGE_SIZE, 615 NULL, UVM_UNKNOWN_OFFSET, 0, 616 UVM_MAPFLAG(UVM_PROT_ALL, UVM_PROT_ALL, UVM_INH_COPY, 617 UVM_ADV_NORMAL, 618 UVM_FLAG_FIXED|UVM_FLAG_OVERLAY|UVM_FLAG_COPYONW)) != 0) 619 panic("init: couldn't allocate argument space"); 620 p->p_vmspace->vm_maxsaddr = (caddr_t)addr; 621 622 ipx = 0; 623 while (1) { 624 if (boothowto & RB_ASKNAME) { 625 printf("init path"); 626 if (initpaths[ipx]) 627 printf(" (default %s)", initpaths[ipx]); 628 printf(": "); 629 len = cngetsn(ipath, sizeof(ipath)-1); 630 if (len == 0) { 631 if (initpaths[ipx]) 632 path = initpaths[ipx++]; 633 else 634 continue; 635 } else { 636 ipath[len] = '\0'; 637 path = ipath; 638 } 639 } else { 640 if ((path = initpaths[ipx++]) == NULL) 641 break; 642 } 643 644 ucp = (char *)(addr + PAGE_SIZE); 645 646 /* 647 * Construct the boot flag argument. 648 */ 649 flagsp = flags; 650 *flagsp++ = '-'; 651 options = 0; 652 653 if (boothowto & RB_SINGLE) { 654 *flagsp++ = 's'; 655 options = 1; 656 } 657 #ifdef notyet 658 if (boothowto & RB_FASTBOOT) { 659 *flagsp++ = 'f'; 660 options = 1; 661 } 662 #endif 663 664 /* 665 * Move out the flags (arg 1), if necessary. 666 */ 667 if (options != 0) { 668 *flagsp++ = '\0'; 669 i = flagsp - flags; 670 #ifdef DEBUG 671 printf("init: copying out flags `%s' %d\n", flags, i); 672 #endif 673 (void)copyout((caddr_t)flags, (caddr_t)(ucp -= i), i); 674 arg1 = ucp; 675 } 676 677 /* 678 * Move out the file name (also arg 0). 679 */ 680 i = strlen(path) + 1; 681 #ifdef DEBUG 682 printf("init: copying out path `%s' %d\n", path, i); 683 #else 684 if (boothowto & RB_ASKNAME || path != initpaths[0]) 685 printf("init: trying %s\n", path); 686 #endif 687 (void)copyout((caddr_t)path, (caddr_t)(ucp -= i), i); 688 arg0 = ucp; 689 690 /* 691 * Move out the arg pointers. 692 */ 693 uap = (char **)((long)ucp & ~ALIGNBYTES); 694 (void)suword((caddr_t)--uap, 0); /* terminator */ 695 if (options != 0) 696 (void)suword((caddr_t)--uap, (long)arg1); 697 slash = strrchr(path, '/'); 698 if (slash) 699 (void)suword((caddr_t)--uap, 700 (long)arg0 + (slash + 1 - path)); 701 else 702 (void)suword((caddr_t)--uap, (long)arg0); 703 704 /* 705 * Point at the arguments. 706 */ 707 SCARG(&args, path) = arg0; 708 SCARG(&args, argp) = uap; 709 SCARG(&args, envp) = NULL; 710 711 /* 712 * Now try to exec the program. If can't for any reason 713 * other than it doesn't exist, complain. 714 */ 715 error = sys_execve(p, &args, retval); 716 if (error == 0 || error == EJUSTRETURN) { 717 KERNEL_PROC_UNLOCK(p); 718 return; 719 } 720 printf("exec %s: error %d\n", path, error); 721 } 722 printf("init: not found\n"); 723 panic("no init"); 724 } 725