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#include <sys/watchdog.h> 70 71#include <ddb/ddb.h> 72 73#include <machine/cpu.h> 74#include <machine/pcb.h> 75#include <machine/smp.h> 76 77#include <security/mac/mac_framework.h> 78 79#include <vm/vm.h> 80#include <vm/vm_object.h> 81#include <vm/vm_page.h> 82#include <vm/vm_pager.h> 83#include <vm/swap_pager.h> 84 85#include <sys/signalvar.h> 86 87#ifndef PANIC_REBOOT_WAIT_TIME 88#define PANIC_REBOOT_WAIT_TIME 15 /* default to 15 seconds */ 89#endif 90static int panic_reboot_wait_time = PANIC_REBOOT_WAIT_TIME; 91SYSCTL_INT(_kern, OID_AUTO, panic_reboot_wait_time, CTLFLAG_RW | CTLFLAG_TUN, 92 &panic_reboot_wait_time, 0, 93 "Seconds to wait before rebooting after a panic"); 94TUNABLE_INT("kern.panic_reboot_wait_time", &panic_reboot_wait_time); 95 96/* 97 * Note that stdarg.h and the ANSI style va_start macro is used for both 98 * ANSI and traditional C compilers. 99 */ 100#include <machine/stdarg.h> 101 102#ifdef KDB 103#ifdef KDB_UNATTENDED 104int debugger_on_panic = 0; 105#else 106int debugger_on_panic = 1; 107#endif 108SYSCTL_INT(_debug, OID_AUTO, debugger_on_panic, 109 CTLFLAG_RW | CTLFLAG_SECURE | CTLFLAG_TUN, 110 &debugger_on_panic, 0, "Run debugger on kernel panic"); 111TUNABLE_INT("debug.debugger_on_panic", &debugger_on_panic); 112 113#ifdef KDB_TRACE 114static int trace_on_panic = 1; 115#else 116static int trace_on_panic = 0; 117#endif 118SYSCTL_INT(_debug, OID_AUTO, trace_on_panic, 119 CTLFLAG_RW | CTLFLAG_SECURE | CTLFLAG_TUN, 120 &trace_on_panic, 0, "Print stack trace on kernel panic"); 121TUNABLE_INT("debug.trace_on_panic", &trace_on_panic); 122#endif /* KDB */ 123 124static int sync_on_panic = 0; 125SYSCTL_INT(_kern, OID_AUTO, sync_on_panic, CTLFLAG_RW | CTLFLAG_TUN, 126 &sync_on_panic, 0, "Do a sync before rebooting from a panic"); 127TUNABLE_INT("kern.sync_on_panic", &sync_on_panic); 128 129static int stop_scheduler_on_panic = 1; 130SYSCTL_INT(_kern, OID_AUTO, stop_scheduler_on_panic, CTLFLAG_RW | CTLFLAG_TUN, 131 &stop_scheduler_on_panic, 0, "stop scheduler upon entering panic"); 132TUNABLE_INT("kern.stop_scheduler_on_panic", &stop_scheduler_on_panic); 133 134static SYSCTL_NODE(_kern, OID_AUTO, shutdown, CTLFLAG_RW, 0, 135 "Shutdown environment"); 136 137#ifndef DIAGNOSTIC 138static int show_busybufs; 139#else 140static int show_busybufs = 1; 141#endif 142SYSCTL_INT(_kern_shutdown, OID_AUTO, show_busybufs, CTLFLAG_RW, 143 &show_busybufs, 0, ""); 144 145/* 146 * Variable panicstr contains argument to first call to panic; used as flag 147 * to indicate that the kernel has already called panic. 148 */ 149const char *panicstr; 150 151int dumping; /* system is dumping */ 152int rebooting; /* system is rebooting */ 153static struct dumperinfo dumper; /* our selected dumper */ 154 155/* Context information for dump-debuggers. */ 156static struct pcb dumppcb; /* Registers. */ 157lwpid_t dumptid; /* Thread ID. */ 158 159static void poweroff_wait(void *, int); 160static void shutdown_halt(void *junk, int howto); 161static void shutdown_panic(void *junk, int howto); 162static void shutdown_reset(void *junk, int howto); 163 164/* register various local shutdown events */ 165static void 166shutdown_conf(void *unused) 167{ 168 169 EVENTHANDLER_REGISTER(shutdown_final, poweroff_wait, NULL, 170 SHUTDOWN_PRI_FIRST); 171 EVENTHANDLER_REGISTER(shutdown_final, shutdown_halt, NULL, 172 SHUTDOWN_PRI_LAST + 100); 173 EVENTHANDLER_REGISTER(shutdown_final, shutdown_panic, NULL, 174 SHUTDOWN_PRI_LAST + 100); 175 EVENTHANDLER_REGISTER(shutdown_final, shutdown_reset, NULL, 176 SHUTDOWN_PRI_LAST + 200); 177} 178 179SYSINIT(shutdown_conf, SI_SUB_INTRINSIC, SI_ORDER_ANY, shutdown_conf, NULL); 180 181/* 182 * The system call that results in a reboot. 183 */ 184/* ARGSUSED */ 185int 186sys_reboot(struct thread *td, struct reboot_args *uap) 187{ 188 int error; 189 190 error = 0; 191#ifdef MAC 192 error = mac_system_check_reboot(td->td_ucred, uap->opt); 193#endif 194 if (error == 0) 195 error = priv_check(td, PRIV_REBOOT); 196 if (error == 0) { 197 mtx_lock(&Giant); 198 kern_reboot(uap->opt); 199 mtx_unlock(&Giant); 200 } 201 return (error); 202} 203 204/* 205 * Called by events that want to shut down.. e.g <CTL><ALT><DEL> on a PC 206 */ 207static int shutdown_howto = 0; 208 209void 210shutdown_nice(int howto) 211{ 212 213 shutdown_howto = howto; 214 215 /* Send a signal to init(8) and have it shutdown the world */ 216 if (initproc != NULL) { 217 PROC_LOCK(initproc); 218 kern_psignal(initproc, SIGINT); 219 PROC_UNLOCK(initproc); 220 } else { 221 /* No init(8) running, so simply reboot */ 222 kern_reboot(RB_NOSYNC); 223 } 224 return; 225} 226static int waittime = -1; 227 228static void 229print_uptime(void) 230{ 231 int f; 232 struct timespec ts; 233 234 getnanouptime(&ts); 235 printf("Uptime: "); 236 f = 0; 237 if (ts.tv_sec >= 86400) { 238 printf("%ldd", (long)ts.tv_sec / 86400); 239 ts.tv_sec %= 86400; 240 f = 1; 241 } 242 if (f || ts.tv_sec >= 3600) { 243 printf("%ldh", (long)ts.tv_sec / 3600); 244 ts.tv_sec %= 3600; 245 f = 1; 246 } 247 if (f || ts.tv_sec >= 60) { 248 printf("%ldm", (long)ts.tv_sec / 60); 249 ts.tv_sec %= 60; 250 f = 1; 251 } 252 printf("%lds\n", (long)ts.tv_sec); 253} 254 255int 256doadump(boolean_t textdump) 257{ 258 boolean_t coredump; 259 260 if (dumping) 261 return (EBUSY); 262 if (dumper.dumper == NULL) 263 return (ENXIO); 264 265 savectx(&dumppcb); 266 dumptid = curthread->td_tid; 267 dumping++; 268 269 coredump = TRUE; 270#ifdef DDB 271 if (textdump && textdump_pending) { 272 coredump = FALSE; 273 textdump_dumpsys(&dumper); 274 } 275#endif 276 if (coredump) 277 dumpsys(&dumper); 278 279 dumping--; 280 return (0); 281} 282 283static int 284isbufbusy(struct buf *bp) 285{ 286 if (((bp->b_flags & (B_INVAL | B_PERSISTENT)) == 0 && 287 BUF_ISLOCKED(bp)) || 288 ((bp->b_flags & (B_DELWRI | B_INVAL)) == B_DELWRI)) 289 return (1); 290 return (0); 291} 292 293/* 294 * Shutdown the system cleanly to prepare for reboot, halt, or power off. 295 */ 296void 297kern_reboot(int howto) 298{ 299 static int first_buf_printf = 1; 300 301#if defined(SMP) 302 /* 303 * Bind us to CPU 0 so that all shutdown code runs there. Some 304 * systems don't shutdown properly (i.e., ACPI power off) if we 305 * run on another processor. 306 */ 307 if (!SCHEDULER_STOPPED()) { 308 thread_lock(curthread); 309 sched_bind(curthread, 0); 310 thread_unlock(curthread); 311 KASSERT(PCPU_GET(cpuid) == 0, ("boot: not running on cpu 0")); 312 } 313#endif 314 /* We're in the process of rebooting. */ 315 rebooting = 1; 316 317 /* collect extra flags that shutdown_nice might have set */ 318 howto |= shutdown_howto; 319 320 /* We are out of the debugger now. */ 321 kdb_active = 0; 322 323 /* 324 * Do any callouts that should be done BEFORE syncing the filesystems. 325 */ 326 EVENTHANDLER_INVOKE(shutdown_pre_sync, howto); 327 328 /* 329 * Now sync filesystems 330 */ 331 if (!cold && (howto & RB_NOSYNC) == 0 && waittime < 0) { 332 register struct buf *bp; 333 int iter, nbusy, pbusy; 334#ifndef PREEMPTION 335 int subiter; 336#endif 337 338 waittime = 0; 339 340 wdog_kern_pat(WD_LASTVAL); 341 sys_sync(curthread, NULL); 342 343 /* 344 * With soft updates, some buffers that are 345 * written will be remarked as dirty until other 346 * buffers are written. 347 */ 348 for (iter = pbusy = 0; iter < 20; iter++) { 349 nbusy = 0; 350 for (bp = &buf[nbuf]; --bp >= buf; ) 351 if (isbufbusy(bp)) 352 nbusy++; 353 if (nbusy == 0) { 354 if (first_buf_printf) 355 printf("All buffers synced."); 356 break; 357 } 358 if (first_buf_printf) { 359 printf("Syncing disks, buffers remaining... "); 360 first_buf_printf = 0; 361 } 362 printf("%d ", nbusy); 363 if (nbusy < pbusy) 364 iter = 0; 365 pbusy = nbusy; 366 367 wdog_kern_pat(WD_LASTVAL); 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 */ 466static void 467shutdown_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 */ 489static void 490shutdown_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 */ 522static void 523shutdown_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 */ 556void 557panic(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 655static int poweroff_delay = POWEROFF_DELAY; 656 657SYSCTL_INT(_kern_shutdown, OID_AUTO, poweroff_delay, CTLFLAG_RW, 658 &poweroff_delay, 0, ""); 659 660static void 661poweroff_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 */ 676static int kproc_shutdown_wait = 60; 677SYSCTL_INT(_kern_shutdown, OID_AUTO, kproc_shutdown_wait, CTLFLAG_RW, 678 &kproc_shutdown_wait, 0, ""); 679 680void 681kproc_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 700void 701kthread_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 */ 721int 722set_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. */ 736int 737dump_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 752void 753mkdumpheader(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