1 /* $NetBSD: init_main.c,v 1.206 2002/09/04 01:32:31 matt 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 1.206 2002/09/04 01:32:31 matt 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/map.h> 67 #include <sys/proc.h> 68 #include <sys/kthread.h> 69 #include <sys/resourcevar.h> 70 #include <sys/signalvar.h> 71 #include <sys/systm.h> 72 #include <sys/vnode.h> 73 #include <sys/tty.h> 74 #include <sys/conf.h> 75 #include <sys/disklabel.h> 76 #include <sys/buf.h> 77 #include <sys/device.h> 78 #include <sys/disk.h> 79 #include <sys/exec.h> 80 #include <sys/socketvar.h> 81 #include <sys/protosw.h> 82 #include <sys/reboot.h> 83 #include <sys/user.h> 84 #include <sys/sysctl.h> 85 #ifdef SYSVSHM 86 #include <sys/shm.h> 87 #endif 88 #ifdef SYSVSEM 89 #include <sys/sem.h> 90 #endif 91 #ifdef SYSVMSG 92 #include <sys/msg.h> 93 #endif 94 #ifdef SYSTRACE 95 #include <sys/systrace.h> 96 #endif 97 #include <sys/domain.h> 98 #include <sys/mbuf.h> 99 #include <sys/namei.h> 100 #if NRND > 0 101 #include <sys/rnd.h> 102 #endif 103 #ifndef PIPE_SOCKETPAIR 104 #include <sys/pipe.h> 105 #endif 106 107 #include <sys/syscall.h> 108 #include <sys/syscallargs.h> 109 110 #include <ufs/ufs/quota.h> 111 112 #include <miscfs/genfs/genfs.h> 113 #include <miscfs/syncfs/syncfs.h> 114 115 #include <machine/cpu.h> 116 117 #include <uvm/uvm.h> 118 119 #include <dev/cons.h> 120 121 #include <net/if.h> 122 #include <net/raw_cb.h> 123 124 const char copyright[] = 125 "Copyright (c) 1996, 1997, 1998, 1999, 2000, 2001, 2002\n" 126 " The NetBSD Foundation, Inc. All rights reserved.\n" 127 "Copyright (c) 1982, 1986, 1989, 1991, 1993\n" 128 " The Regents of the University of California. All rights reserved.\n" 129 "\n"; 130 131 /* Components of the first process -- never freed. */ 132 struct session session0; 133 struct pgrp pgrp0; 134 struct proc proc0; 135 struct pcred cred0; 136 struct filedesc0 filedesc0; 137 struct cwdinfo cwdi0; 138 struct plimit limit0; 139 struct vmspace vmspace0; 140 struct sigacts sigacts0; 141 #ifndef curproc 142 struct proc *curproc = &proc0; 143 #endif 144 struct proc *initproc; 145 146 int cmask = CMASK; 147 extern struct user *proc0paddr; 148 149 struct vnode *rootvp, *swapdev_vp; 150 int boothowto; 151 int cold = 1; /* still working on startup */ 152 struct timeval boottime; 153 154 __volatile int start_init_exec; /* semaphore for start_init() */ 155 156 static void check_console(struct proc *p); 157 static void start_init(void *); 158 void main(void); 159 160 extern const struct emul emul_netbsd; /* defined in kern_exec.c */ 161 162 /* 163 * System startup; initialize the world, create process 0, mount root 164 * filesystem, and fork to create init and pagedaemon. Most of the 165 * hard work is done in the lower-level initialization routines including 166 * startup(), which does memory initialization and autoconfiguration. 167 */ 168 void 169 main(void) 170 { 171 struct proc *p; 172 struct pdevinit *pdev; 173 int s, error; 174 u_int i; 175 rlim_t lim; 176 extern struct pdevinit pdevinit[]; 177 extern void schedcpu(void *); 178 #if defined(NFSSERVER) || defined(NFS) 179 extern void nfs_init(void); 180 #endif 181 #ifdef NVNODE_IMPLICIT 182 int usevnodes; 183 #endif 184 185 /* 186 * Initialize the current process pointer (curproc) before 187 * any possible traps/probes to simplify trap processing. 188 */ 189 simple_lock_init(&proc0.p_raslock); 190 p = &proc0; 191 curproc = p; 192 p->p_cpu = curcpu(); 193 /* 194 * Attempt to find console and initialize 195 * in case of early panic or other messages. 196 */ 197 consinit(); 198 printf("%s", copyright); 199 200 KERNEL_LOCK_INIT(); 201 202 uvm_init(); 203 204 /* Do machine-dependent initialization. */ 205 cpu_startup(); 206 207 /* Initialize callouts. */ 208 callout_startup(); 209 210 /* 211 * Initialize mbuf's. Do this now because we might attempt to 212 * allocate mbufs or mbuf clusters during autoconfiguration. 213 */ 214 mbinit(); 215 216 /* Initialize sockets. */ 217 soinit(); 218 219 /* 220 * The following 3 things must be done before autoconfiguration. 221 */ 222 disk_init(); /* initialize disk list */ 223 tty_init(); /* initialize tty list */ 224 #if NRND > 0 225 rnd_init(); /* initialize RNG */ 226 #endif 227 228 /* Initialize the sysctl subsystem. */ 229 sysctl_init(); 230 231 /* 232 * Initialize process and pgrp structures. 233 */ 234 procinit(); 235 236 /* 237 * Create process 0 (the swapper). 238 */ 239 s = proclist_lock_write(); 240 LIST_INSERT_HEAD(&allproc, p, p_list); 241 LIST_INSERT_HEAD(PIDHASH(p->p_pid), p, p_hash); 242 proclist_unlock_write(s); 243 244 p->p_pgrp = &pgrp0; 245 LIST_INSERT_HEAD(PGRPHASH(0), &pgrp0, pg_hash); 246 LIST_INIT(&pgrp0.pg_members); 247 LIST_INSERT_HEAD(&pgrp0.pg_members, p, p_pglist); 248 249 pgrp0.pg_session = &session0; 250 session0.s_count = 1; 251 session0.s_sid = p->p_pid; 252 session0.s_leader = p; 253 254 /* 255 * Set P_NOCLDWAIT so that kernel threads are reparented to 256 * init(8) when they exit. init(8) can easily wait them out 257 * for us. 258 */ 259 p->p_flag = P_INMEM | P_SYSTEM | P_NOCLDWAIT; 260 p->p_stat = SONPROC; 261 p->p_nice = NZERO; 262 p->p_emul = &emul_netbsd; 263 #ifdef __HAVE_SYSCALL_INTERN 264 (*p->p_emul->e_syscall_intern)(p); 265 #endif 266 strncpy(p->p_comm, "swapper", MAXCOMLEN); 267 268 callout_init(&p->p_realit_ch); 269 callout_init(&p->p_tsleep_ch); 270 271 /* Create credentials. */ 272 cred0.p_refcnt = 1; 273 p->p_cred = &cred0; 274 p->p_ucred = crget(); 275 p->p_ucred->cr_ngroups = 1; /* group 0 */ 276 277 /* Create the file descriptor table. */ 278 finit(); 279 p->p_fd = &filedesc0.fd_fd; 280 fdinit1(&filedesc0); 281 282 /* Create the CWD info. */ 283 p->p_cwdi = &cwdi0; 284 cwdi0.cwdi_cmask = cmask; 285 cwdi0.cwdi_refcnt = 1; 286 287 /* Create the limits structures. */ 288 p->p_limit = &limit0; 289 for (i = 0; i < sizeof(p->p_rlimit)/sizeof(p->p_rlimit[0]); i++) 290 limit0.pl_rlimit[i].rlim_cur = 291 limit0.pl_rlimit[i].rlim_max = RLIM_INFINITY; 292 293 limit0.pl_rlimit[RLIMIT_NOFILE].rlim_max = maxfiles; 294 limit0.pl_rlimit[RLIMIT_NOFILE].rlim_cur = 295 maxfiles < NOFILE ? maxfiles : NOFILE; 296 297 limit0.pl_rlimit[RLIMIT_NPROC].rlim_max = maxproc; 298 limit0.pl_rlimit[RLIMIT_NPROC].rlim_cur = 299 maxproc < MAXUPRC ? maxproc : MAXUPRC; 300 301 lim = ptoa(uvmexp.free); 302 limit0.pl_rlimit[RLIMIT_RSS].rlim_max = lim; 303 limit0.pl_rlimit[RLIMIT_MEMLOCK].rlim_max = lim; 304 limit0.pl_rlimit[RLIMIT_MEMLOCK].rlim_cur = lim / 3; 305 limit0.pl_corename = defcorename; 306 limit0.p_refcnt = 1; 307 308 /* 309 * Initialize proc0's vmspace, which uses the kernel pmap. 310 * All kernel processes (which never have user space mappings) 311 * share proc0's vmspace, and thus, the kernel pmap. 312 */ 313 uvmspace_init(&vmspace0, pmap_kernel(), round_page(VM_MIN_ADDRESS), 314 trunc_page(VM_MAX_ADDRESS)); 315 p->p_vmspace = &vmspace0; 316 317 p->p_addr = proc0paddr; /* XXX */ 318 319 /* 320 * We continue to place resource usage info in the 321 * user struct so they're pageable. 322 */ 323 p->p_stats = &p->p_addr->u_stats; 324 325 /* 326 * Charge root for one process. 327 */ 328 (void)chgproccnt(0, 1); 329 330 rqinit(); 331 332 /* Configure virtual memory system, set vm rlimits. */ 333 uvm_init_limits(p); 334 335 /* Initialize the file systems. */ 336 #if defined(NFSSERVER) || defined(NFS) 337 nfs_init(); /* initialize server/shared data */ 338 #endif 339 #ifdef NVNODE_IMPLICIT 340 /* 341 * If maximum number of vnodes in namei vnode cache is not explicitly 342 * defined in kernel config, adjust the number such as we use roughly 343 * 0.5% of memory for vnode cache (but not less than NVNODE vnodes). 344 */ 345 usevnodes = (ptoa((unsigned)physmem) / 200) / sizeof(struct vnode); 346 if (usevnodes > desiredvnodes) 347 desiredvnodes = usevnodes; 348 #endif 349 vfsinit(); 350 351 /* Configure the system hardware. This will enable interrupts. */ 352 configure(); 353 354 ubc_init(); /* must be after autoconfig */ 355 356 /* Lock the kernel on behalf of proc0. */ 357 KERNEL_PROC_LOCK(p); 358 359 #ifdef SYSVSHM 360 /* Initialize System V style shared memory. */ 361 shminit(); 362 #endif 363 364 #ifdef SYSVSEM 365 /* Initialize System V style semaphores. */ 366 seminit(); 367 #endif 368 369 #ifdef SYSVMSG 370 /* Initialize System V style message queues. */ 371 msginit(); 372 #endif 373 374 /* Attach pseudo-devices. */ 375 for (pdev = pdevinit; pdev->pdev_attach != NULL; pdev++) 376 (*pdev->pdev_attach)(pdev->pdev_count); 377 378 /* 379 * Initialize protocols. Block reception of incoming packets 380 * until everything is ready. 381 */ 382 s = splnet(); 383 ifinit(); 384 domaininit(); 385 if_attachdomain(); 386 splx(s); 387 388 #ifdef GPROF 389 /* Initialize kernel profiling. */ 390 kmstartup(); 391 #endif 392 393 /* Initialize system accouting. */ 394 acct_init(); 395 396 #ifdef SYSTRACE 397 systrace_init(); 398 #endif 399 /* 400 * Initialize signal-related data structures, and signal state 401 * for proc0. 402 */ 403 signal_init(); 404 p->p_sigacts = &sigacts0; 405 siginit(p); 406 407 /* Kick off timeout driven events by calling first time. */ 408 schedcpu(NULL); 409 410 /* 411 * Create process 1 (init(8)). We do this now, as Unix has 412 * historically had init be process 1, and changing this would 413 * probably upset a lot of people. 414 * 415 * Note that process 1 won't immediately exec init(8), but will 416 * wait for us to inform it that the root file system has been 417 * mounted. 418 */ 419 if (fork1(p, 0, SIGCHLD, NULL, 0, start_init, NULL, NULL, &initproc)) 420 panic("fork init"); 421 422 /* 423 * Create any kernel threads who's creation was deferred because 424 * initproc had not yet been created. 425 */ 426 kthread_run_deferred_queue(); 427 428 /* 429 * Now that device driver threads have been created, wait for 430 * them to finish any deferred autoconfiguration. Note we don't 431 * need to lock this semaphore, since we haven't booted any 432 * secondary processors, yet. 433 */ 434 while (config_pending) 435 (void) tsleep((void *)&config_pending, PWAIT, "cfpend", 0); 436 437 /* 438 * Now that autoconfiguration has completed, we can determine 439 * the root and dump devices. 440 */ 441 cpu_rootconf(); 442 cpu_dumpconf(); 443 444 /* Mount the root file system. */ 445 do { 446 domountroothook(); 447 if ((error = vfs_mountroot())) { 448 printf("cannot mount root, error = %d\n", error); 449 boothowto |= RB_ASKNAME; 450 setroot(root_device, 451 (rootdev != NODEV) ? DISKPART(rootdev) : 0); 452 } 453 } while (error != 0); 454 mountroothook_destroy(); 455 456 CIRCLEQ_FIRST(&mountlist)->mnt_flag |= MNT_ROOTFS; 457 CIRCLEQ_FIRST(&mountlist)->mnt_op->vfs_refcount++; 458 459 /* 460 * Get the vnode for '/'. Set filedesc0.fd_fd.fd_cdir to 461 * reference it. 462 */ 463 if (VFS_ROOT(CIRCLEQ_FIRST(&mountlist), &rootvnode)) 464 panic("cannot find root vnode"); 465 cwdi0.cwdi_cdir = rootvnode; 466 VREF(cwdi0.cwdi_cdir); 467 VOP_UNLOCK(rootvnode, 0); 468 cwdi0.cwdi_rdir = NULL; 469 470 /* 471 * Now that root is mounted, we can fixup initproc's CWD 472 * info. All other processes are kthreads, which merely 473 * share proc0's CWD info. 474 */ 475 initproc->p_cwdi->cwdi_cdir = rootvnode; 476 VREF(initproc->p_cwdi->cwdi_cdir); 477 initproc->p_cwdi->cwdi_rdir = NULL; 478 479 /* 480 * Now can look at time, having had a chance to verify the time 481 * from the file system. Reset p->p_rtime as it may have been 482 * munched in mi_switch() after the time got set. 483 */ 484 proclist_lock_read(); 485 s = splsched(); 486 for (p = LIST_FIRST(&allproc); p != NULL; 487 p = LIST_NEXT(p, p_list)) { 488 p->p_stats->p_start = mono_time = boottime = time; 489 if (p->p_cpu != NULL) 490 p->p_cpu->ci_schedstate.spc_runtime = time; 491 p->p_rtime.tv_sec = p->p_rtime.tv_usec = 0; 492 } 493 splx(s); 494 proclist_unlock_read(); 495 496 /* Create the pageout daemon kernel thread. */ 497 uvm_swap_init(); 498 if (kthread_create1(uvm_pageout, NULL, NULL, "pagedaemon")) 499 panic("fork pagedaemon"); 500 501 /* Create the process reaper kernel thread. */ 502 if (kthread_create1(reaper, NULL, NULL, "reaper")) 503 panic("fork reaper"); 504 505 /* Create the filesystem syncer kernel thread. */ 506 if (kthread_create1(sched_sync, NULL, NULL, "ioflush")) 507 panic("fork syncer"); 508 509 /* Create the aiodone daemon kernel thread. */ 510 if (kthread_create1(uvm_aiodone_daemon, NULL, NULL, "aiodoned")) 511 panic("fork aiodoned"); 512 513 #if defined(MULTIPROCESSOR) 514 /* Boot the secondary processors. */ 515 cpu_boot_secondary_processors(); 516 #endif 517 518 /* Initialize exec structures */ 519 exec_init(1); 520 521 #ifndef PIPE_SOCKETPAIR 522 /* Initialize pipe structures */ 523 pipe_init(); 524 #endif 525 526 /* 527 * Okay, now we can let init(8) exec! It's off to userland! 528 */ 529 start_init_exec = 1; 530 wakeup((void *)&start_init_exec); 531 532 /* The scheduler is an infinite loop. */ 533 uvm_scheduler(); 534 /* NOTREACHED */ 535 } 536 537 static void 538 check_console(struct proc *p) 539 { 540 struct nameidata nd; 541 int error; 542 543 NDINIT(&nd, LOOKUP, FOLLOW, UIO_SYSSPACE, "/dev/console", p); 544 error = namei(&nd); 545 if (error == 0) 546 vrele(nd.ni_vp); 547 else if (error == ENOENT) 548 printf("warning: no /dev/console\n"); 549 else 550 printf("warning: lookup /dev/console: error %d\n", error); 551 } 552 553 /* 554 * List of paths to try when searching for "init". 555 */ 556 static const char *initpaths[] = { 557 "/sbin/init", 558 "/sbin/oinit", 559 "/sbin/init.bak", 560 NULL, 561 }; 562 563 /* 564 * Start the initial user process; try exec'ing each pathname in "initpaths". 565 * The program is invoked with one argument containing the boot flags. 566 */ 567 static void 568 start_init(void *arg) 569 { 570 struct proc *p = arg; 571 vaddr_t addr; 572 struct sys_execve_args /* { 573 syscallarg(const char *) path; 574 syscallarg(char * const *) argp; 575 syscallarg(char * const *) envp; 576 } */ args; 577 int options, i, error; 578 register_t retval[2]; 579 char flags[4], *flagsp; 580 const char *path, *slash; 581 char *ucp, **uap, *arg0, *arg1 = NULL; 582 char ipath[129]; 583 int ipx, len; 584 585 /* 586 * Now in process 1. 587 */ 588 strncpy(p->p_comm, "init", MAXCOMLEN); 589 590 /* 591 * Wait for main() to tell us that it's safe to exec. 592 */ 593 while (start_init_exec == 0) 594 (void) tsleep((void *)&start_init_exec, PWAIT, "initexec", 0); 595 596 /* 597 * This is not the right way to do this. We really should 598 * hand-craft a descriptor onto /dev/console to hand to init, 599 * but that's a _lot_ more work, and the benefit from this easy 600 * hack makes up for the "good is the enemy of the best" effect. 601 */ 602 check_console(p); 603 604 /* 605 * Need just enough stack to hold the faked-up "execve()" arguments. 606 */ 607 addr = USRSTACK - PAGE_SIZE; 608 if (uvm_map(&p->p_vmspace->vm_map, &addr, PAGE_SIZE, 609 NULL, UVM_UNKNOWN_OFFSET, 0, 610 UVM_MAPFLAG(UVM_PROT_ALL, UVM_PROT_ALL, UVM_INH_COPY, 611 UVM_ADV_NORMAL, 612 UVM_FLAG_FIXED|UVM_FLAG_OVERLAY|UVM_FLAG_COPYONW)) != 0) 613 panic("init: couldn't allocate argument space"); 614 p->p_vmspace->vm_maxsaddr = (caddr_t)addr; 615 616 ipx = 0; 617 while (1) { 618 if (boothowto & RB_ASKNAME) { 619 printf("init path"); 620 if (initpaths[ipx]) 621 printf(" (default %s)", initpaths[ipx]); 622 printf(": "); 623 len = cngetsn(ipath, sizeof(ipath)-1); 624 if (len == 0) { 625 if (initpaths[ipx]) 626 path = initpaths[ipx++]; 627 else 628 continue; 629 } else { 630 ipath[len] = '\0'; 631 path = ipath; 632 } 633 } else { 634 if ((path = initpaths[ipx++]) == NULL) 635 break; 636 } 637 638 ucp = (char *)(addr + PAGE_SIZE); 639 640 /* 641 * Construct the boot flag argument. 642 */ 643 flagsp = flags; 644 *flagsp++ = '-'; 645 options = 0; 646 647 if (boothowto & RB_SINGLE) { 648 *flagsp++ = 's'; 649 options = 1; 650 } 651 #ifdef notyet 652 if (boothowto & RB_FASTBOOT) { 653 *flagsp++ = 'f'; 654 options = 1; 655 } 656 #endif 657 658 /* 659 * Move out the flags (arg 1), if necessary. 660 */ 661 if (options != 0) { 662 *flagsp++ = '\0'; 663 i = flagsp - flags; 664 #ifdef DEBUG 665 printf("init: copying out flags `%s' %d\n", flags, i); 666 #endif 667 (void)copyout((caddr_t)flags, (caddr_t)(ucp -= i), i); 668 arg1 = ucp; 669 } 670 671 /* 672 * Move out the file name (also arg 0). 673 */ 674 i = strlen(path) + 1; 675 #ifdef DEBUG 676 printf("init: copying out path `%s' %d\n", path, i); 677 #else 678 if (boothowto & RB_ASKNAME || path != initpaths[0]) 679 printf("init: trying %s\n", path); 680 #endif 681 (void)copyout((caddr_t)path, (caddr_t)(ucp -= i), i); 682 arg0 = ucp; 683 684 /* 685 * Move out the arg pointers. 686 */ 687 uap = (char **)((long)ucp & ~ALIGNBYTES); 688 (void)suword((caddr_t)--uap, 0); /* terminator */ 689 if (options != 0) 690 (void)suword((caddr_t)--uap, (long)arg1); 691 slash = strrchr(path, '/'); 692 if (slash) 693 (void)suword((caddr_t)--uap, 694 (long)arg0 + (slash + 1 - path)); 695 else 696 (void)suword((caddr_t)--uap, (long)arg0); 697 698 /* 699 * Point at the arguments. 700 */ 701 SCARG(&args, path) = arg0; 702 SCARG(&args, argp) = uap; 703 SCARG(&args, envp) = NULL; 704 705 /* 706 * Now try to exec the program. If can't for any reason 707 * other than it doesn't exist, complain. 708 */ 709 error = sys_execve(p, &args, retval); 710 if (error == 0 || error == EJUSTRETURN) { 711 KERNEL_PROC_UNLOCK(p); 712 return; 713 } 714 printf("exec %s: error %d\n", path, error); 715 } 716 printf("init: not found\n"); 717 panic("no init"); 718 } 719