The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/amd64/amd64/dump_machdep.c

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    1 /*-
    2  * Copyright (c) 2002 Poul-Henning Kamp
    3  * Copyright (c) 2002 Networks Associates Technology, Inc.
    4  * All rights reserved.
    5  *
    6  * This software was developed for the FreeBSD Project by Poul-Henning Kamp
    7  * and NAI Labs, the Security Research Division of Network Associates, Inc.
    8  * under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), as part of the
    9  * DARPA CHATS research program.
   10  *
   11  * Redistribution and use in source and binary forms, with or without
   12  * modification, are permitted provided that the following conditions
   13  * are met:
   14  * 1. Redistributions of source code must retain the above copyright
   15  *    notice, this list of conditions and the following disclaimer.
   16  * 2. Redistributions in binary form must reproduce the above copyright
   17  *    notice, this list of conditions and the following disclaimer in the
   18  *    documentation and/or other materials provided with the distribution.
   19  * 3. The names of the authors may not be used to endorse or promote
   20  *    products derived from this software without specific prior written
   21  *    permission.
   22  *
   23  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   33  * SUCH DAMAGE.
   34  *
   35  * $FreeBSD: releng/5.1/sys/amd64/amd64/dump_machdep.c 114349 2003-05-01 01:05:25Z peter $
   36  */
   37 
   38 #include <sys/param.h>
   39 #include <sys/systm.h>
   40 #include <sys/conf.h>
   41 #include <sys/cons.h>
   42 #include <sys/kernel.h>
   43 #include <sys/kerneldump.h>
   44 #include <vm/vm.h>
   45 #include <vm/pmap.h>
   46 #include <machine/md_var.h>
   47 
   48 CTASSERT(sizeof(struct kerneldumpheader) == 512);
   49 
   50 static struct kerneldumpheader kdh;
   51 
   52 void
   53 dumpsys(struct dumperinfo *di)
   54 {
   55         off_t dumplo;
   56         vm_offset_t a, addr;
   57         u_int count, left, u;
   58         void *va;
   59         int i, mb;
   60         int c;
   61 
   62         printf("Dumping %ld MB\n", Maxmem / (1024*1024 / PAGE_SIZE));
   63 
   64         /* Fill in the kernel dump header */
   65         strcpy(kdh.magic, KERNELDUMPMAGIC);
   66         strcpy(kdh.architecture, "amd64");
   67         kdh.version = htod32(KERNELDUMPVERSION);
   68         kdh.architectureversion = htod32(KERNELDUMP_I386_VERSION);
   69         kdh.dumplength = htod64(Maxmem * (off_t)PAGE_SIZE);
   70         kdh.dumptime = htod64(time_second);
   71         kdh.blocksize = htod32(di->blocksize);
   72         strncpy(kdh.hostname, hostname, sizeof kdh.hostname);
   73         strncpy(kdh.versionstring, version, sizeof kdh.versionstring);
   74         if (panicstr != NULL)
   75                 strncpy(kdh.panicstring, panicstr, sizeof kdh.panicstring);
   76         kdh.parity = kerneldump_parity(&kdh);
   77 
   78         /*
   79          * Check if we will have enough room to save the coredump.
   80          * The partition size needed is the sum of:
   81          * Memory to save + header + trailer + Room to leave untouched
   82          * at partition head. (an arbitrary amount).
   83          */
   84         if (di->mediasize <  
   85             Maxmem * (off_t)PAGE_SIZE + sizeof kdh * 2 + 64*1024) {
   86                 printf("\nDump failed. Partition too small.\n");
   87                 return;
   88         }
   89         dumplo = di->mediaoffset + di->mediasize - Maxmem * (off_t)PAGE_SIZE;
   90         dumplo -= sizeof kdh * 2;
   91         i = di->dumper(di->priv, &kdh, 0, dumplo, sizeof kdh);
   92         if (i)
   93                 printf("\nDump failed writing header (%d)\n", i);
   94         dumplo += sizeof kdh;
   95         i = 0;
   96         addr = 0;
   97         va = 0;
   98         mb = 0;
   99         for (count = 0; count < Maxmem;) {
  100                 left = Maxmem - count;
  101                 if (left > MAXDUMPPGS)
  102                         left = MAXDUMPPGS;
  103                 for (u = 0; u < left; u++) {
  104                         a = addr + u * PAGE_SIZE;
  105                         if (!is_physical_memory(a))
  106                                 a = 0;
  107                         va = pmap_kenter_temporary(trunc_page(a), u);
  108                 }
  109                 i = count / (16*1024*1024 / PAGE_SIZE);
  110                 if (i != mb) {
  111                         printf(" %d", count / (1024 * 1024 / PAGE_SIZE));
  112                         mb = i;
  113                 }
  114                 i = di->dumper(di->priv, va, 0, dumplo, left * PAGE_SIZE);
  115                 if (i)
  116                         break;
  117                 count += left;
  118                 dumplo += left * PAGE_SIZE;
  119                 addr += left * PAGE_SIZE;
  120                 if ((c = cncheckc()) == 0x03) {
  121                         printf("\nDump aborted.\n");
  122                         return;
  123                 } else if (c != -1)
  124                         printf("[CTRL-C to abort] ");
  125         }
  126         if (i) 
  127                 printf("\nDump failed writing data (%d)\n", i);
  128         i = di->dumper(di->priv, &kdh, 0, dumplo, sizeof kdh);
  129         if (i)
  130                 printf("\nDump failed writing trailer (%d)\n", i);
  131         di->dumper(di->priv, NULL, 0, 0, 0);  /* tell them we are done */
  132         printf("\nDump complete\n");
  133         return;
  134 }

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