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 Marcel Moolenaar
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  *
    9  * 1. Redistributions of source code must retain the above copyright
   10  *    notice, this list of conditions and the following disclaimer.
   11  * 2. Redistributions in binary form must reproduce the above copyright
   12  *    notice, this list of conditions and the following disclaimer in the
   13  *    documentation and/or other materials provided with the distribution.
   14  *
   15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   16  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   17  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   18  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   19  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   20  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   21  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   22  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   23  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   24  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   25  */
   26 
   27 #include <sys/cdefs.h>
   28 __FBSDID("$FreeBSD: releng/6.1/sys/amd64/amd64/dump_machdep.c 158179 2006-04-30 16:44:43Z cvs2svn $");
   29 
   30 #include <sys/param.h>
   31 #include <sys/systm.h>
   32 #include <sys/conf.h>
   33 #include <sys/cons.h>
   34 #include <sys/kernel.h>
   35 #include <sys/kerneldump.h>
   36 #include <vm/vm.h>
   37 #include <vm/pmap.h>
   38 #include <machine/elf.h>
   39 #include <machine/md_var.h>
   40 
   41 CTASSERT(sizeof(struct kerneldumpheader) == 512);
   42 
   43 /*
   44  * Don't touch the first SIZEOF_METADATA bytes on the dump device. This
   45  * is to protect us from metadata and to protect metadata from us.
   46  */
   47 #define SIZEOF_METADATA         (64*1024)
   48 
   49 #define MD_ALIGN(x)     (((off_t)(x) + PAGE_MASK) & ~PAGE_MASK)
   50 #define DEV_ALIGN(x)    (((off_t)(x) + (DEV_BSIZE-1)) & ~(DEV_BSIZE-1))
   51 
   52 struct md_pa {
   53         vm_paddr_t md_start;
   54         vm_paddr_t md_size;
   55 };
   56 
   57 typedef int callback_t(struct md_pa *, int, void *);
   58 
   59 static struct kerneldumpheader kdh;
   60 static off_t dumplo, fileofs;
   61 
   62 /* Handle buffered writes. */
   63 static char buffer[DEV_BSIZE];
   64 static size_t fragsz;
   65 
   66 /* 20 phys_avail entry pairs correspond to 10 md_pa's */
   67 static struct md_pa dump_map[10];
   68 
   69 static void
   70 md_pa_init(void)
   71 {
   72         int n, idx;
   73 
   74         bzero(dump_map, sizeof(dump_map));
   75         for (n = 0; n < sizeof(dump_map) / sizeof(dump_map[0]); n++) {
   76                 idx = n * 2;
   77                 if (dump_avail[idx] == 0 && dump_avail[idx + 1] == 0)
   78                         break;
   79                 dump_map[n].md_start = dump_avail[idx];
   80                 dump_map[n].md_size = dump_avail[idx + 1] - dump_avail[idx];
   81         }
   82 }
   83 
   84 static struct md_pa *
   85 md_pa_first(void)
   86 {
   87 
   88         return (&dump_map[0]);
   89 }
   90 
   91 static struct md_pa *
   92 md_pa_next(struct md_pa *mdp)
   93 {
   94 
   95         mdp++;
   96         if (mdp->md_size == 0)
   97                 mdp = NULL;
   98         return (mdp);
   99 }
  100 
  101 /* XXX should be MI */
  102 static void
  103 mkdumpheader(struct kerneldumpheader *kdh, uint32_t archver, uint64_t dumplen,
  104     uint32_t blksz)
  105 {
  106 
  107         bzero(kdh, sizeof(*kdh));
  108         strncpy(kdh->magic, KERNELDUMPMAGIC, sizeof(kdh->magic));
  109         strncpy(kdh->architecture, MACHINE_ARCH, sizeof(kdh->architecture));
  110         kdh->version = htod32(KERNELDUMPVERSION);
  111         kdh->architectureversion = htod32(archver);
  112         kdh->dumplength = htod64(dumplen);
  113         kdh->dumptime = htod64(time_second);
  114         kdh->blocksize = htod32(blksz);
  115         strncpy(kdh->hostname, hostname, sizeof(kdh->hostname));
  116         strncpy(kdh->versionstring, version, sizeof(kdh->versionstring));
  117         if (panicstr != NULL)
  118                 strncpy(kdh->panicstring, panicstr, sizeof(kdh->panicstring));
  119         kdh->parity = kerneldump_parity(kdh);
  120 }
  121 
  122 static int
  123 buf_write(struct dumperinfo *di, char *ptr, size_t sz)
  124 {
  125         size_t len;
  126         int error;
  127 
  128         while (sz) {
  129                 len = DEV_BSIZE - fragsz;
  130                 if (len > sz)
  131                         len = sz;
  132                 bcopy(ptr, buffer + fragsz, len);
  133                 fragsz += len;
  134                 ptr += len;
  135                 sz -= len;
  136                 if (fragsz == DEV_BSIZE) {
  137                         error = di->dumper(di->priv, buffer, 0, dumplo,
  138                             DEV_BSIZE);
  139                         if (error)
  140                                 return error;
  141                         dumplo += DEV_BSIZE;
  142                         fragsz = 0;
  143                 }
  144         }
  145 
  146         return (0);
  147 }
  148 
  149 static int
  150 buf_flush(struct dumperinfo *di)
  151 {
  152         int error;
  153 
  154         if (fragsz == 0)
  155                 return (0);
  156 
  157         error = di->dumper(di->priv, buffer, 0, dumplo, DEV_BSIZE);
  158         dumplo += DEV_BSIZE;
  159         fragsz = 0;
  160         return (error);
  161 }
  162 
  163 #define PG2MB(pgs) ((pgs + (1 << 8) - 1) >> 8)
  164 
  165 static int
  166 cb_dumpdata(struct md_pa *mdp, int seqnr, void *arg)
  167 {
  168         struct dumperinfo *di = (struct dumperinfo*)arg;
  169         vm_paddr_t a, pa;
  170         void *va;
  171         uint64_t pgs;
  172         size_t counter, sz, chunk;
  173         int i, c, error, twiddle;
  174 
  175         error = 0;      /* catch case in which chunk size is 0 */
  176         counter = 0;    /* Update twiddle every 16MB */
  177         twiddle = 0;
  178         va = 0;
  179         pgs = mdp->md_size / PAGE_SIZE;
  180         pa = mdp->md_start;
  181 
  182         printf("  chunk %d: %ldMB (%ld pages)", seqnr, PG2MB(pgs), pgs);
  183 
  184         while (pgs) {
  185                 chunk = pgs;
  186                 if (chunk > MAXDUMPPGS)
  187                         chunk = MAXDUMPPGS;
  188                 sz = chunk << PAGE_SHIFT;
  189                 counter += sz;
  190                 if (counter >> 24) {
  191                         printf(" %ld", PG2MB(pgs));
  192                         counter &= (1<<24) - 1;
  193                 }
  194                 for (i = 0; i < chunk; i++) {
  195                         a = pa + i * PAGE_SIZE;
  196                         va = pmap_kenter_temporary(trunc_page(a), i);
  197                 }
  198                 error = di->dumper(di->priv, va, 0, dumplo, sz);
  199                 if (error)
  200                         break;
  201                 dumplo += sz;
  202                 pgs -= chunk;
  203                 pa += sz;
  204 
  205                 /* Check for user abort. */
  206                 c = cncheckc();
  207                 if (c == 0x03)
  208                         return (ECANCELED);
  209                 if (c != -1)
  210                         printf(" (CTRL-C to abort) ");
  211         }
  212         printf(" ... %s\n", (error) ? "fail" : "ok");
  213         return (error);
  214 }
  215 
  216 static int
  217 cb_dumphdr(struct md_pa *mdp, int seqnr, void *arg)
  218 {
  219         struct dumperinfo *di = (struct dumperinfo*)arg;
  220         Elf_Phdr phdr;
  221         uint64_t size;
  222         int error;
  223 
  224         size = mdp->md_size;
  225         bzero(&phdr, sizeof(phdr));
  226         phdr.p_type = PT_LOAD;
  227         phdr.p_flags = PF_R;                    /* XXX */
  228         phdr.p_offset = fileofs;
  229         phdr.p_vaddr = mdp->md_start;
  230         phdr.p_paddr = mdp->md_start;
  231         phdr.p_filesz = size;
  232         phdr.p_memsz = size;
  233         phdr.p_align = PAGE_SIZE;
  234 
  235         error = buf_write(di, (char*)&phdr, sizeof(phdr));
  236         fileofs += phdr.p_filesz;
  237         return (error);
  238 }
  239 
  240 static int
  241 cb_size(struct md_pa *mdp, int seqnr, void *arg)
  242 {
  243         uint64_t *sz = (uint64_t*)arg;
  244 
  245         *sz += (uint64_t)mdp->md_size;
  246         return (0);
  247 }
  248 
  249 static int
  250 foreach_chunk(callback_t cb, void *arg)
  251 {
  252         struct md_pa *mdp;
  253         int error, seqnr;
  254 
  255         seqnr = 0;
  256         mdp = md_pa_first();
  257         while (mdp != NULL) {
  258                 error = (*cb)(mdp, seqnr++, arg);
  259                 if (error)
  260                         return (-error);
  261                 mdp = md_pa_next(mdp);
  262         }
  263         return (seqnr);
  264 }
  265 
  266 void
  267 dumpsys(struct dumperinfo *di)
  268 {
  269         Elf_Ehdr ehdr;
  270         uint64_t dumpsize;
  271         off_t hdrgap;
  272         size_t hdrsz;
  273         int error;
  274 
  275         bzero(&ehdr, sizeof(ehdr));
  276         ehdr.e_ident[EI_MAG0] = ELFMAG0;
  277         ehdr.e_ident[EI_MAG1] = ELFMAG1;
  278         ehdr.e_ident[EI_MAG2] = ELFMAG2;
  279         ehdr.e_ident[EI_MAG3] = ELFMAG3;
  280         ehdr.e_ident[EI_CLASS] = ELF_CLASS;
  281 #if BYTE_ORDER == LITTLE_ENDIAN
  282         ehdr.e_ident[EI_DATA] = ELFDATA2LSB;
  283 #else
  284         ehdr.e_ident[EI_DATA] = ELFDATA2MSB;
  285 #endif
  286         ehdr.e_ident[EI_VERSION] = EV_CURRENT;
  287         ehdr.e_ident[EI_OSABI] = ELFOSABI_STANDALONE;   /* XXX big picture? */
  288         ehdr.e_type = ET_CORE;
  289         ehdr.e_machine = EM_X86_64;
  290         ehdr.e_phoff = sizeof(ehdr);
  291         ehdr.e_flags = 0;
  292         ehdr.e_ehsize = sizeof(ehdr);
  293         ehdr.e_phentsize = sizeof(Elf_Phdr);
  294         ehdr.e_shentsize = sizeof(Elf_Shdr);
  295 
  296         md_pa_init();
  297 
  298         /* Calculate dump size. */
  299         dumpsize = 0L;
  300         ehdr.e_phnum = foreach_chunk(cb_size, &dumpsize);
  301         hdrsz = ehdr.e_phoff + ehdr.e_phnum * ehdr.e_phentsize;
  302         fileofs = MD_ALIGN(hdrsz);
  303         dumpsize += fileofs;
  304         hdrgap = fileofs - DEV_ALIGN(hdrsz);
  305 
  306         /* Determine dump offset on device. */
  307         if (di->mediasize < SIZEOF_METADATA + dumpsize + sizeof(kdh) * 2) {
  308                 error = ENOSPC;
  309                 goto fail;
  310         }
  311         dumplo = di->mediaoffset + di->mediasize - dumpsize;
  312         dumplo -= sizeof(kdh) * 2;
  313 
  314         mkdumpheader(&kdh, KERNELDUMP_AMD64_VERSION, dumpsize, di->blocksize);
  315 
  316         printf("Dumping %llu MB (%d chunks)\n", (long long)dumpsize >> 20,
  317             ehdr.e_phnum);
  318 
  319         /* Dump leader */
  320         error = di->dumper(di->priv, &kdh, 0, dumplo, sizeof(kdh));
  321         if (error)
  322                 goto fail;
  323         dumplo += sizeof(kdh);
  324 
  325         /* Dump ELF header */
  326         error = buf_write(di, (char*)&ehdr, sizeof(ehdr));
  327         if (error)
  328                 goto fail;
  329 
  330         /* Dump program headers */
  331         error = foreach_chunk(cb_dumphdr, di);
  332         if (error < 0)
  333                 goto fail;
  334         buf_flush(di);
  335 
  336         /*
  337          * All headers are written using blocked I/O, so we know the
  338          * current offset is (still) block aligned. Skip the alignement
  339          * in the file to have the segment contents aligned at page
  340          * boundary. We cannot use MD_ALIGN on dumplo, because we don't
  341          * care and may very well be unaligned within the dump device.
  342          */
  343         dumplo += hdrgap;
  344 
  345         /* Dump memory chunks (updates dumplo) */
  346         error = foreach_chunk(cb_dumpdata, di);
  347         if (error < 0)
  348                 goto fail;
  349 
  350         /* Dump trailer */
  351         error = di->dumper(di->priv, &kdh, 0, dumplo, sizeof(kdh));
  352         if (error)
  353                 goto fail;
  354 
  355         /* Signal completion, signoff and exit stage left. */
  356         di->dumper(di->priv, NULL, 0, 0, 0);
  357         printf("\nDump complete\n");
  358         return;
  359 
  360  fail:
  361         if (error < 0)
  362                 error = -error;
  363 
  364         if (error == ECANCELED)
  365                 printf("\nDump aborted\n");
  366         else if (error == ENOSPC)
  367                 printf("\nDump failed. Partition too small.\n");
  368         else
  369                 printf("\n** DUMP FAILED (ERROR %d) **\n", error);
  370 }

Cache object: adf783656e5226ba1770cc695c0f73f1


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