1 /*- 2 * Copyright (c) 1986, 1988, 1991, 1993 3 * The Regents of the University of California. All rights reserved. 4 * (c) UNIX System Laboratories, Inc. 5 * All or some portions of this file are derived from material licensed 6 * to the University of California by American Telephone and Telegraph 7 * Co. or Unix System Laboratories, Inc. and are reproduced herein with 8 * the permission of UNIX System Laboratories, Inc. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 4. Neither the name of the University nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 * 34 * @(#)kern_shutdown.c 8.3 (Berkeley) 1/21/94 35 */ 36 37 #include <sys/cdefs.h> 38 __FBSDID("$FreeBSD$"); 39 40 #include "opt_ddb.h" 41 #include "opt_kdb.h" 42 #include "opt_panic.h" 43 #include "opt_sched.h" 44 #include "opt_watchdog.h" 45 46 #include <sys/param.h> 47 #include <sys/systm.h> 48 #include <sys/bio.h> 49 #include <sys/buf.h> 50 #include <sys/conf.h> 51 #include <sys/cons.h> 52 #include <sys/eventhandler.h> 53 #include <sys/jail.h> 54 #include <sys/kdb.h> 55 #include <sys/kernel.h> 56 #include <sys/kerneldump.h> 57 #include <sys/kthread.h> 58 #include <sys/malloc.h> 59 #include <sys/mount.h> 60 #include <sys/priv.h> 61 #include <sys/proc.h> 62 #include <sys/reboot.h> 63 #include <sys/resourcevar.h> 64 #include <sys/sched.h> 65 #include <sys/smp.h> 66 #include <sys/sysctl.h> 67 #include <sys/sysproto.h> 68 #include <sys/vnode.h> 69 #ifdef SW_WATCHDOG 70 #include <sys/watchdog.h> 71 #endif 72 73 #include <ddb/ddb.h> 74 75 #include <machine/cpu.h> 76 #include <machine/pcb.h> 77 #include <machine/smp.h> 78 79 #include <security/mac/mac_framework.h> 80 81 #include <vm/vm.h> 82 #include <vm/vm_object.h> 83 #include <vm/vm_page.h> 84 #include <vm/vm_pager.h> 85 #include <vm/swap_pager.h> 86 87 #include <sys/signalvar.h> 88 89 #ifndef PANIC_REBOOT_WAIT_TIME 90 #define PANIC_REBOOT_WAIT_TIME 15 /* default to 15 seconds */ 91 #endif 92 93 /* 94 * Note that stdarg.h and the ANSI style va_start macro is used for both 95 * ANSI and traditional C compilers. 96 */ 97 #include <machine/stdarg.h> 98 99 #ifdef KDB 100 #ifdef KDB_UNATTENDED 101 int debugger_on_panic = 0; 102 #else 103 int debugger_on_panic = 1; 104 #endif 105 SYSCTL_INT(_debug, OID_AUTO, debugger_on_panic, 106 CTLFLAG_RW | CTLFLAG_SECURE | CTLFLAG_TUN, 107 &debugger_on_panic, 0, "Run debugger on kernel panic"); 108 TUNABLE_INT("debug.debugger_on_panic", &debugger_on_panic); 109 110 #ifdef KDB_TRACE 111 static int trace_on_panic = 1; 112 #else 113 static int trace_on_panic = 0; 114 #endif 115 SYSCTL_INT(_debug, OID_AUTO, trace_on_panic, 116 CTLFLAG_RW | CTLFLAG_SECURE | CTLFLAG_TUN, 117 &trace_on_panic, 0, "Print stack trace on kernel panic"); 118 TUNABLE_INT("debug.trace_on_panic", &trace_on_panic); 119 #endif /* KDB */ 120 121 static int sync_on_panic = 0; 122 SYSCTL_INT(_kern, OID_AUTO, sync_on_panic, CTLFLAG_RW | CTLFLAG_TUN, 123 &sync_on_panic, 0, "Do a sync before rebooting from a panic"); 124 TUNABLE_INT("kern.sync_on_panic", &sync_on_panic); 125 126 static int stop_scheduler_on_panic = 1; 127 SYSCTL_INT(_kern, OID_AUTO, stop_scheduler_on_panic, CTLFLAG_RW | CTLFLAG_TUN, 128 &stop_scheduler_on_panic, 0, "stop scheduler upon entering panic"); 129 TUNABLE_INT("kern.stop_scheduler_on_panic", &stop_scheduler_on_panic); 130 131 static SYSCTL_NODE(_kern, OID_AUTO, shutdown, CTLFLAG_RW, 0, 132 "Shutdown environment"); 133 134 #ifndef DIAGNOSTIC 135 static int show_busybufs; 136 #else 137 static int show_busybufs = 1; 138 #endif 139 SYSCTL_INT(_kern_shutdown, OID_AUTO, show_busybufs, CTLFLAG_RW, 140 &show_busybufs, 0, ""); 141 142 /* 143 * Variable panicstr contains argument to first call to panic; used as flag 144 * to indicate that the kernel has already called panic. 145 */ 146 const char *panicstr; 147 148 int dumping; /* system is dumping */ 149 int rebooting; /* system is rebooting */ 150 static struct dumperinfo dumper; /* our selected dumper */ 151 152 /* Context information for dump-debuggers. */ 153 static struct pcb dumppcb; /* Registers. */ 154 lwpid_t dumptid; /* Thread ID. */ 155 156 static void poweroff_wait(void *, int); 157 static void shutdown_halt(void *junk, int howto); 158 static void shutdown_panic(void *junk, int howto); 159 static void shutdown_reset(void *junk, int howto); 160 161 /* register various local shutdown events */ 162 static void 163 shutdown_conf(void *unused) 164 { 165 166 EVENTHANDLER_REGISTER(shutdown_final, poweroff_wait, NULL, 167 SHUTDOWN_PRI_FIRST); 168 EVENTHANDLER_REGISTER(shutdown_final, shutdown_halt, NULL, 169 SHUTDOWN_PRI_LAST + 100); 170 EVENTHANDLER_REGISTER(shutdown_final, shutdown_panic, NULL, 171 SHUTDOWN_PRI_LAST + 100); 172 EVENTHANDLER_REGISTER(shutdown_final, shutdown_reset, NULL, 173 SHUTDOWN_PRI_LAST + 200); 174 } 175 176 SYSINIT(shutdown_conf, SI_SUB_INTRINSIC, SI_ORDER_ANY, shutdown_conf, NULL); 177 178 /* 179 * The system call that results in a reboot. 180 */ 181 /* ARGSUSED */ 182 int 183 sys_reboot(struct thread *td, struct reboot_args *uap) 184 { 185 int error; 186 187 error = 0; 188 #ifdef MAC 189 error = mac_system_check_reboot(td->td_ucred, uap->opt); 190 #endif 191 if (error == 0) 192 error = priv_check(td, PRIV_REBOOT); 193 if (error == 0) { 194 mtx_lock(&Giant); 195 kern_reboot(uap->opt); 196 mtx_unlock(&Giant); 197 } 198 return (error); 199 } 200 201 /* 202 * Called by events that want to shut down.. e.g <CTL><ALT><DEL> on a PC 203 */ 204 static int shutdown_howto = 0; 205 206 void 207 shutdown_nice(int howto) 208 { 209 210 shutdown_howto = howto; 211 212 /* Send a signal to init(8) and have it shutdown the world */ 213 if (initproc != NULL) { 214 PROC_LOCK(initproc); 215 kern_psignal(initproc, SIGINT); 216 PROC_UNLOCK(initproc); 217 } else { 218 /* No init(8) running, so simply reboot */ 219 kern_reboot(RB_NOSYNC); 220 } 221 return; 222 } 223 static int waittime = -1; 224 225 static void 226 print_uptime(void) 227 { 228 int f; 229 struct timespec ts; 230 231 getnanouptime(&ts); 232 printf("Uptime: "); 233 f = 0; 234 if (ts.tv_sec >= 86400) { 235 printf("%ldd", (long)ts.tv_sec / 86400); 236 ts.tv_sec %= 86400; 237 f = 1; 238 } 239 if (f || ts.tv_sec >= 3600) { 240 printf("%ldh", (long)ts.tv_sec / 3600); 241 ts.tv_sec %= 3600; 242 f = 1; 243 } 244 if (f || ts.tv_sec >= 60) { 245 printf("%ldm", (long)ts.tv_sec / 60); 246 ts.tv_sec %= 60; 247 f = 1; 248 } 249 printf("%lds\n", (long)ts.tv_sec); 250 } 251 252 int 253 doadump(boolean_t textdump) 254 { 255 boolean_t coredump; 256 257 if (dumping) 258 return (EBUSY); 259 if (dumper.dumper == NULL) 260 return (ENXIO); 261 262 savectx(&dumppcb); 263 dumptid = curthread->td_tid; 264 dumping++; 265 266 coredump = TRUE; 267 #ifdef DDB 268 if (textdump && textdump_pending) { 269 coredump = FALSE; 270 textdump_dumpsys(&dumper); 271 } 272 #endif 273 if (coredump) 274 dumpsys(&dumper); 275 276 dumping--; 277 return (0); 278 } 279 280 static int 281 isbufbusy(struct buf *bp) 282 { 283 if (((bp->b_flags & (B_INVAL | B_PERSISTENT)) == 0 && 284 BUF_ISLOCKED(bp)) || 285 ((bp->b_flags & (B_DELWRI | B_INVAL)) == B_DELWRI)) 286 return (1); 287 return (0); 288 } 289 290 /* 291 * Shutdown the system cleanly to prepare for reboot, halt, or power off. 292 */ 293 void 294 kern_reboot(int howto) 295 { 296 static int first_buf_printf = 1; 297 298 #if defined(SMP) 299 /* 300 * Bind us to CPU 0 so that all shutdown code runs there. Some 301 * systems don't shutdown properly (i.e., ACPI power off) if we 302 * run on another processor. 303 */ 304 if (!SCHEDULER_STOPPED()) { 305 thread_lock(curthread); 306 sched_bind(curthread, 0); 307 thread_unlock(curthread); 308 KASSERT(PCPU_GET(cpuid) == 0, ("boot: not running on cpu 0")); 309 } 310 #endif 311 /* We're in the process of rebooting. */ 312 rebooting = 1; 313 314 /* collect extra flags that shutdown_nice might have set */ 315 howto |= shutdown_howto; 316 317 /* We are out of the debugger now. */ 318 kdb_active = 0; 319 320 /* 321 * Do any callouts that should be done BEFORE syncing the filesystems. 322 */ 323 EVENTHANDLER_INVOKE(shutdown_pre_sync, howto); 324 325 /* 326 * Now sync filesystems 327 */ 328 if (!cold && (howto & RB_NOSYNC) == 0 && waittime < 0) { 329 register struct buf *bp; 330 int iter, nbusy, pbusy; 331 #ifndef PREEMPTION 332 int subiter; 333 #endif 334 335 waittime = 0; 336 337 #ifdef SW_WATCHDOG 338 wdog_kern_pat(WD_LASTVAL); 339 #endif 340 sys_sync(curthread, NULL); 341 342 /* 343 * With soft updates, some buffers that are 344 * written will be remarked as dirty until other 345 * buffers are written. 346 */ 347 for (iter = pbusy = 0; iter < 20; iter++) { 348 nbusy = 0; 349 for (bp = &buf[nbuf]; --bp >= buf; ) 350 if (isbufbusy(bp)) 351 nbusy++; 352 if (nbusy == 0) { 353 if (first_buf_printf) 354 printf("All buffers synced."); 355 break; 356 } 357 if (first_buf_printf) { 358 printf("Syncing disks, buffers remaining... "); 359 first_buf_printf = 0; 360 } 361 printf("%d ", nbusy); 362 if (nbusy < pbusy) 363 iter = 0; 364 pbusy = nbusy; 365 #ifdef SW_WATCHDOG 366 wdog_kern_pat(WD_LASTVAL); 367 #endif 368 sys_sync(curthread, NULL); 369 370 #ifdef PREEMPTION 371 /* 372 * Drop Giant and spin for a while to allow 373 * interrupt threads to run. 374 */ 375 DROP_GIANT(); 376 DELAY(50000 * iter); 377 PICKUP_GIANT(); 378 #else 379 /* 380 * Drop Giant and context switch several times to 381 * allow interrupt threads to run. 382 */ 383 DROP_GIANT(); 384 for (subiter = 0; subiter < 50 * iter; subiter++) { 385 thread_lock(curthread); 386 mi_switch(SW_VOL, NULL); 387 thread_unlock(curthread); 388 DELAY(1000); 389 } 390 PICKUP_GIANT(); 391 #endif 392 } 393 printf("\n"); 394 /* 395 * Count only busy local buffers to prevent forcing 396 * a fsck if we're just a client of a wedged NFS server 397 */ 398 nbusy = 0; 399 for (bp = &buf[nbuf]; --bp >= buf; ) { 400 if (isbufbusy(bp)) { 401 #if 0 402 /* XXX: This is bogus. We should probably have a BO_REMOTE flag instead */ 403 if (bp->b_dev == NULL) { 404 TAILQ_REMOVE(&mountlist, 405 bp->b_vp->v_mount, mnt_list); 406 continue; 407 } 408 #endif 409 nbusy++; 410 if (show_busybufs > 0) { 411 printf( 412 "%d: buf:%p, vnode:%p, flags:%0x, blkno:%jd, lblkno:%jd, buflock:", 413 nbusy, bp, bp->b_vp, bp->b_flags, 414 (intmax_t)bp->b_blkno, 415 (intmax_t)bp->b_lblkno); 416 BUF_LOCKPRINTINFO(bp); 417 if (show_busybufs > 1) 418 vn_printf(bp->b_vp, 419 "vnode content: "); 420 } 421 } 422 } 423 if (nbusy) { 424 /* 425 * Failed to sync all blocks. Indicate this and don't 426 * unmount filesystems (thus forcing an fsck on reboot). 427 */ 428 printf("Giving up on %d buffers\n", nbusy); 429 DELAY(5000000); /* 5 seconds */ 430 } else { 431 if (!first_buf_printf) 432 printf("Final sync complete\n"); 433 /* 434 * Unmount filesystems 435 */ 436 if (panicstr == 0) 437 vfs_unmountall(); 438 } 439 swapoff_all(); 440 DELAY(100000); /* wait for console output to finish */ 441 } 442 443 print_uptime(); 444 445 cngrab(); 446 447 /* 448 * Ok, now do things that assume all filesystem activity has 449 * been completed. 450 */ 451 EVENTHANDLER_INVOKE(shutdown_post_sync, howto); 452 453 if ((howto & (RB_HALT|RB_DUMP)) == RB_DUMP && !cold && !dumping) 454 doadump(TRUE); 455 456 /* Now that we're going to really halt the system... */ 457 EVENTHANDLER_INVOKE(shutdown_final, howto); 458 459 for(;;) ; /* safety against shutdown_reset not working */ 460 /* NOTREACHED */ 461 } 462 463 /* 464 * If the shutdown was a clean halt, behave accordingly. 465 */ 466 static void 467 shutdown_halt(void *junk, int howto) 468 { 469 470 if (howto & RB_HALT) { 471 printf("\n"); 472 printf("The operating system has halted.\n"); 473 printf("Please press any key to reboot.\n\n"); 474 switch (cngetc()) { 475 case -1: /* No console, just die */ 476 cpu_halt(); 477 /* NOTREACHED */ 478 default: 479 howto &= ~RB_HALT; 480 break; 481 } 482 } 483 } 484 485 /* 486 * Check to see if the system paniced, pause and then reboot 487 * according to the specified delay. 488 */ 489 static void 490 shutdown_panic(void *junk, int howto) 491 { 492 int loop; 493 494 if (howto & RB_DUMP) { 495 if (PANIC_REBOOT_WAIT_TIME != 0) { 496 if (PANIC_REBOOT_WAIT_TIME != -1) { 497 printf("Automatic reboot in %d seconds - " 498 "press a key on the console to abort\n", 499 PANIC_REBOOT_WAIT_TIME); 500 for (loop = PANIC_REBOOT_WAIT_TIME * 10; 501 loop > 0; --loop) { 502 DELAY(1000 * 100); /* 1/10th second */ 503 /* Did user type a key? */ 504 if (cncheckc() != -1) 505 break; 506 } 507 if (!loop) 508 return; 509 } 510 } else { /* zero time specified - reboot NOW */ 511 return; 512 } 513 printf("--> Press a key on the console to reboot,\n"); 514 printf("--> or switch off the system now.\n"); 515 cngetc(); 516 } 517 } 518 519 /* 520 * Everything done, now reset 521 */ 522 static void 523 shutdown_reset(void *junk, int howto) 524 { 525 526 printf("Rebooting...\n"); 527 DELAY(1000000); /* wait 1 sec for printf's to complete and be read */ 528 529 /* 530 * Acquiring smp_ipi_mtx here has a double effect: 531 * - it disables interrupts avoiding CPU0 preemption 532 * by fast handlers (thus deadlocking against other CPUs) 533 * - it avoids deadlocks against smp_rendezvous() or, more 534 * generally, threads busy-waiting, with this spinlock held, 535 * and waiting for responses by threads on other CPUs 536 * (ie. smp_tlb_shootdown()). 537 * 538 * For the !SMP case it just needs to handle the former problem. 539 */ 540 #ifdef SMP 541 mtx_lock_spin(&smp_ipi_mtx); 542 #else 543 spinlock_enter(); 544 #endif 545 546 /* cpu_boot(howto); */ /* doesn't do anything at the moment */ 547 cpu_reset(); 548 /* NOTREACHED */ /* assuming reset worked */ 549 } 550 551 /* 552 * Panic is called on unresolvable fatal errors. It prints "panic: mesg", 553 * and then reboots. If we are called twice, then we avoid trying to sync 554 * the disks as this often leads to recursive panics. 555 */ 556 void 557 panic(const char *fmt, ...) 558 { 559 #ifdef SMP 560 static volatile u_int panic_cpu = NOCPU; 561 cpuset_t other_cpus; 562 #endif 563 struct thread *td = curthread; 564 int bootopt, newpanic; 565 va_list ap; 566 static char buf[256]; 567 568 if (stop_scheduler_on_panic) 569 spinlock_enter(); 570 else 571 critical_enter(); 572 573 #ifdef SMP 574 /* 575 * We don't want multiple CPU's to panic at the same time, so we 576 * use panic_cpu as a simple spinlock. We have to keep checking 577 * panic_cpu if we are spinning in case the panic on the first 578 * CPU is canceled. 579 */ 580 if (panic_cpu != PCPU_GET(cpuid)) 581 while (atomic_cmpset_int(&panic_cpu, NOCPU, 582 PCPU_GET(cpuid)) == 0) 583 while (panic_cpu != NOCPU) 584 ; /* nothing */ 585 586 if (stop_scheduler_on_panic) { 587 if (panicstr == NULL && !kdb_active) { 588 other_cpus = all_cpus; 589 CPU_CLR(PCPU_GET(cpuid), &other_cpus); 590 stop_cpus_hard(other_cpus); 591 } 592 593 /* 594 * We set stop_scheduler here and not in the block above, 595 * because we want to ensure that if panic has been called and 596 * stop_scheduler_on_panic is true, then stop_scheduler will 597 * always be set. Even if panic has been entered from kdb. 598 */ 599 td->td_stopsched = 1; 600 } 601 #endif 602 603 bootopt = RB_AUTOBOOT; 604 newpanic = 0; 605 if (panicstr) 606 bootopt |= RB_NOSYNC; 607 else { 608 bootopt |= RB_DUMP; 609 panicstr = fmt; 610 newpanic = 1; 611 } 612 613 va_start(ap, fmt); 614 if (newpanic) { 615 (void)vsnprintf(buf, sizeof(buf), fmt, ap); 616 panicstr = buf; 617 cngrab(); 618 printf("panic: %s\n", buf); 619 } else { 620 printf("panic: "); 621 vprintf(fmt, ap); 622 printf("\n"); 623 } 624 va_end(ap); 625 #ifdef SMP 626 printf("cpuid = %d\n", PCPU_GET(cpuid)); 627 #endif 628 629 #ifdef KDB 630 if (newpanic && trace_on_panic) 631 kdb_backtrace(); 632 if (debugger_on_panic) 633 kdb_enter(KDB_WHY_PANIC, "panic"); 634 #endif 635 /*thread_lock(td); */ 636 td->td_flags |= TDF_INPANIC; 637 /* thread_unlock(td); */ 638 if (!sync_on_panic) 639 bootopt |= RB_NOSYNC; 640 if (!stop_scheduler_on_panic) 641 critical_exit(); 642 kern_reboot(bootopt); 643 } 644 645 /* 646 * Support for poweroff delay. 647 * 648 * Please note that setting this delay too short might power off your machine 649 * before the write cache on your hard disk has been flushed, leading to 650 * soft-updates inconsistencies. 651 */ 652 #ifndef POWEROFF_DELAY 653 # define POWEROFF_DELAY 5000 654 #endif 655 static int poweroff_delay = POWEROFF_DELAY; 656 657 SYSCTL_INT(_kern_shutdown, OID_AUTO, poweroff_delay, CTLFLAG_RW, 658 &poweroff_delay, 0, "Delay before poweroff to write disk caches (msec)"); 659 660 static void 661 poweroff_wait(void *junk, int howto) 662 { 663 664 if (!(howto & RB_POWEROFF) || poweroff_delay <= 0) 665 return; 666 DELAY(poweroff_delay * 1000); 667 } 668 669 /* 670 * Some system processes (e.g. syncer) need to be stopped at appropriate 671 * points in their main loops prior to a system shutdown, so that they 672 * won't interfere with the shutdown process (e.g. by holding a disk buf 673 * to cause sync to fail). For each of these system processes, register 674 * shutdown_kproc() as a handler for one of shutdown events. 675 */ 676 static int kproc_shutdown_wait = 60; 677 SYSCTL_INT(_kern_shutdown, OID_AUTO, kproc_shutdown_wait, CTLFLAG_RW, 678 &kproc_shutdown_wait, 0, "Max wait time (sec) to stop for each process"); 679 680 void 681 kproc_shutdown(void *arg, int howto) 682 { 683 struct proc *p; 684 int error; 685 686 if (panicstr) 687 return; 688 689 p = (struct proc *)arg; 690 printf("Waiting (max %d seconds) for system process `%s' to stop...", 691 kproc_shutdown_wait, p->p_comm); 692 error = kproc_suspend(p, kproc_shutdown_wait * hz); 693 694 if (error == EWOULDBLOCK) 695 printf("timed out\n"); 696 else 697 printf("done\n"); 698 } 699 700 void 701 kthread_shutdown(void *arg, int howto) 702 { 703 struct thread *td; 704 int error; 705 706 if (panicstr) 707 return; 708 709 td = (struct thread *)arg; 710 printf("Waiting (max %d seconds) for system thread `%s' to stop...", 711 kproc_shutdown_wait, td->td_name); 712 error = kthread_suspend(td, kproc_shutdown_wait * hz); 713 714 if (error == EWOULDBLOCK) 715 printf("timed out\n"); 716 else 717 printf("done\n"); 718 } 719 720 /* Registration of dumpers */ 721 int 722 set_dumper(struct dumperinfo *di) 723 { 724 725 if (di == NULL) { 726 bzero(&dumper, sizeof dumper); 727 return (0); 728 } 729 if (dumper.dumper != NULL) 730 return (EBUSY); 731 dumper = *di; 732 return (0); 733 } 734 735 /* Call dumper with bounds checking. */ 736 int 737 dump_write(struct dumperinfo *di, void *virtual, vm_offset_t physical, 738 off_t offset, size_t length) 739 { 740 741 if (length != 0 && (offset < di->mediaoffset || 742 offset - di->mediaoffset + length > di->mediasize)) { 743 printf("Attempt to write outside dump device boundaries.\n" 744 "offset(%jd), mediaoffset(%jd), length(%ju), mediasize(%jd).\n", 745 (intmax_t)offset, (intmax_t)di->mediaoffset, 746 (uintmax_t)length, (intmax_t)di->mediasize); 747 return (ENOSPC); 748 } 749 return (di->dumper(di->priv, virtual, physical, offset, length)); 750 } 751 752 void 753 mkdumpheader(struct kerneldumpheader *kdh, char *magic, uint32_t archver, 754 uint64_t dumplen, uint32_t blksz) 755 { 756 757 bzero(kdh, sizeof(*kdh)); 758 strncpy(kdh->magic, magic, sizeof(kdh->magic)); 759 strncpy(kdh->architecture, MACHINE_ARCH, sizeof(kdh->architecture)); 760 kdh->version = htod32(KERNELDUMPVERSION); 761 kdh->architectureversion = htod32(archver); 762 kdh->dumplength = htod64(dumplen); 763 kdh->dumptime = htod64(time_second); 764 kdh->blocksize = htod32(blksz); 765 strncpy(kdh->hostname, prison0.pr_hostname, sizeof(kdh->hostname)); 766 strncpy(kdh->versionstring, version, sizeof(kdh->versionstring)); 767 if (panicstr != NULL) 768 strncpy(kdh->panicstring, panicstr, sizeof(kdh->panicstring)); 769 kdh->parity = kerneldump_parity(kdh); 770 } 771