kern_dump.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("$FreeBSD$");
   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/proc.h>
   36 #include <sys/kerneldump.h>
   37 #include <sys/watchdog.h>
   38 #include <vm/vm.h>
   39 #include <vm/vm_param.h>
   40 #include <vm/vm_page.h>
   41 #include <vm/vm_phys.h>
   42 #include <vm/vm_dumpset.h>
   43 #include <vm/pmap.h>
   44 #include <machine/dump.h>
   45 #include <machine/elf.h>
   46 #include <machine/md_var.h>
   47 #include <machine/pcb.h>
   48 
   49 CTASSERT(sizeof(struct kerneldumpheader) == 512);
   50 
   51 #define MD_ALIGN(x)     roundup2((off_t)(x), PAGE_SIZE)
   52 
   53 /* Handle buffered writes. */
   54 static size_t fragsz;
   55 
   56 struct dump_pa dump_map[DUMPSYS_MD_PA_NPAIRS];
   57 
   58 #if !defined(__powerpc__)
   59 void
   60 dumpsys_gen_pa_init(void)
   61 {
   62         int n, idx;
   63 
   64         bzero(dump_map, sizeof(dump_map));
   65         for (n = 0; n < nitems(dump_map); n++) {
   66                 idx = n * 2;
   67                 if (dump_avail[idx] == 0 && dump_avail[idx + 1] == 0)
   68                         break;
   69                 dump_map[n].pa_start = dump_avail[idx];
   70                 dump_map[n].pa_size = dump_avail[idx + 1] - dump_avail[idx];
   71         }
   72 }
   73 #endif
   74 
   75 struct dump_pa *
   76 dumpsys_gen_pa_next(struct dump_pa *mdp)
   77 {
   78 
   79         if (mdp == NULL)
   80                 return (&dump_map[0]);
   81 
   82         mdp++;
   83         if (mdp->pa_size == 0)
   84                 mdp = NULL;
   85         return (mdp);
   86 }
   87 
   88 void
   89 dumpsys_gen_wbinv_all(void)
   90 {
   91 
   92 }
   93 
   94 void
   95 dumpsys_gen_unmap_chunk(vm_paddr_t pa __unused, size_t chunk __unused,
   96     void *va __unused)
   97 {
   98 
   99 }
  100 
  101 int
  102 dumpsys_gen_write_aux_headers(struct dumperinfo *di)
  103 {
  104 
  105         return (0);
  106 }
  107 
  108 int
  109 dumpsys_buf_seek(struct dumperinfo *di, size_t sz)
  110 {
  111         static uint8_t buf[DEV_BSIZE];
  112         size_t nbytes;
  113         int error;
  114 
  115         bzero(buf, sizeof(buf));
  116 
  117         while (sz > 0) {
  118                 nbytes = MIN(sz, sizeof(buf));
  119 
  120                 error = dump_append(di, buf, 0, nbytes);
  121                 if (error)
  122                         return (error);
  123                 sz -= nbytes;
  124         }
  125 
  126         return (0);
  127 }
  128 
  129 int
  130 dumpsys_buf_write(struct dumperinfo *di, char *ptr, size_t sz)
  131 {
  132         size_t len;
  133         int error;
  134 
  135         while (sz) {
  136                 len = di->blocksize - fragsz;
  137                 if (len > sz)
  138                         len = sz;
  139                 memcpy((char *)di->blockbuf + fragsz, ptr, len);
  140                 fragsz += len;
  141                 ptr += len;
  142                 sz -= len;
  143                 if (fragsz == di->blocksize) {
  144                         error = dump_append(di, di->blockbuf, 0, di->blocksize);
  145                         if (error)
  146                                 return (error);
  147                         fragsz = 0;
  148                 }
  149         }
  150         return (0);
  151 }
  152 
  153 int
  154 dumpsys_buf_flush(struct dumperinfo *di)
  155 {
  156         int error;
  157 
  158         if (fragsz == 0)
  159                 return (0);
  160 
  161         error = dump_append(di, di->blockbuf, 0, di->blocksize);
  162         fragsz = 0;
  163         return (error);
  164 }
  165 
  166 CTASSERT(PAGE_SHIFT < 20);
  167 #define PG2MB(pgs) ((pgs + (1 << (20 - PAGE_SHIFT)) - 1) >> (20 - PAGE_SHIFT))
  168 
  169 int
  170 dumpsys_cb_dumpdata(struct dump_pa *mdp, int seqnr, void *arg)
  171 {
  172         struct dumperinfo *di = (struct dumperinfo*)arg;
  173         vm_paddr_t pa;
  174         void *va;
  175         uint64_t pgs;
  176         size_t counter, sz, chunk;
  177         int c, error;
  178         u_int maxdumppgs;
  179 
  180         error = 0;      /* catch case in which chunk size is 0 */
  181         counter = 0;    /* Update twiddle every 16MB */
  182         va = NULL;
  183         pgs = mdp->pa_size / PAGE_SIZE;
  184         pa = mdp->pa_start;
  185         maxdumppgs = min(di->maxiosize / PAGE_SIZE, MAXDUMPPGS);
  186         if (maxdumppgs == 0)    /* seatbelt */
  187                 maxdumppgs = 1;
  188 
  189         printf("  chunk %d: %juMB (%ju pages)", seqnr, (uintmax_t)PG2MB(pgs),
  190             (uintmax_t)pgs);
  191 
  192         dumpsys_wbinv_all();
  193         while (pgs) {
  194                 chunk = pgs;
  195                 if (chunk > maxdumppgs)
  196                         chunk = maxdumppgs;
  197                 sz = chunk << PAGE_SHIFT;
  198                 counter += sz;
  199                 if (counter >> 24) {
  200                         printf(" %ju", (uintmax_t)PG2MB(pgs));
  201                         counter &= (1 << 24) - 1;
  202                 }
  203 
  204                 dumpsys_map_chunk(pa, chunk, &va);
  205                 wdog_kern_pat(WD_LASTVAL);
  206 
  207                 error = dump_append(di, va, 0, sz);
  208                 dumpsys_unmap_chunk(pa, chunk, va);
  209                 if (error)
  210                         break;
  211                 pgs -= chunk;
  212                 pa += sz;
  213 
  214                 /* Check for user abort. */
  215                 c = cncheckc();
  216                 if (c == 0x03)
  217                         return (ECANCELED);
  218                 if (c != -1)
  219                         printf(" (CTRL-C to abort) ");
  220         }
  221         printf(" ... %s\n", (error) ? "fail" : "ok");
  222         return (error);
  223 }
  224 
  225 int
  226 dumpsys_foreach_chunk(dumpsys_callback_t cb, void *arg)
  227 {
  228         struct dump_pa *mdp;
  229         int error, seqnr;
  230 
  231         seqnr = 0;
  232         mdp = dumpsys_pa_next(NULL);
  233         while (mdp != NULL) {
  234                 error = (*cb)(mdp, seqnr++, arg);
  235                 if (error)
  236                         return (-error);
  237                 mdp = dumpsys_pa_next(mdp);
  238         }
  239         return (seqnr);
  240 }
  241 
  242 static off_t fileofs;
  243 
  244 static int
  245 cb_dumphdr(struct dump_pa *mdp, int seqnr, void *arg)
  246 {
  247         struct dumperinfo *di = (struct dumperinfo*)arg;
  248         Elf_Phdr phdr;
  249         uint64_t size;
  250         int error;
  251 
  252         size = mdp->pa_size;
  253         bzero(&phdr, sizeof(phdr));
  254         phdr.p_type = PT_LOAD;
  255         phdr.p_flags = PF_R;                    /* XXX */
  256         phdr.p_offset = fileofs;
  257 #ifdef __powerpc__
  258         phdr.p_vaddr = (do_minidump? mdp->pa_start : ~0L);
  259         phdr.p_paddr = (do_minidump? ~0L : mdp->pa_start);
  260 #else
  261         phdr.p_vaddr = mdp->pa_start;
  262         phdr.p_paddr = mdp->pa_start;
  263 #endif
  264         phdr.p_filesz = size;
  265         phdr.p_memsz = size;
  266         phdr.p_align = PAGE_SIZE;
  267 
  268         error = dumpsys_buf_write(di, (char*)&phdr, sizeof(phdr));
  269         fileofs += phdr.p_filesz;
  270         return (error);
  271 }
  272 
  273 static int
  274 cb_size(struct dump_pa *mdp, int seqnr, void *arg)
  275 {
  276         uint64_t *sz;
  277 
  278         sz = (uint64_t *)arg;
  279         *sz += (uint64_t)mdp->pa_size;
  280         return (0);
  281 }
  282 
  283 int
  284 dumpsys_generic(struct dumperinfo *di)
  285 {
  286         static struct kerneldumpheader kdh;
  287         Elf_Ehdr ehdr;
  288         uint64_t dumpsize;
  289         off_t hdrgap;
  290         size_t hdrsz;
  291         int error;
  292 
  293 #if MINIDUMP_PAGE_TRACKING == 1
  294         if (do_minidump)
  295                 return (minidumpsys(di));
  296 #endif
  297 
  298         bzero(&ehdr, sizeof(ehdr));
  299         ehdr.e_ident[EI_MAG0] = ELFMAG0;
  300         ehdr.e_ident[EI_MAG1] = ELFMAG1;
  301         ehdr.e_ident[EI_MAG2] = ELFMAG2;
  302         ehdr.e_ident[EI_MAG3] = ELFMAG3;
  303         ehdr.e_ident[EI_CLASS] = ELF_CLASS;
  304 #if BYTE_ORDER == LITTLE_ENDIAN
  305         ehdr.e_ident[EI_DATA] = ELFDATA2LSB;
  306 #else
  307         ehdr.e_ident[EI_DATA] = ELFDATA2MSB;
  308 #endif
  309         ehdr.e_ident[EI_VERSION] = EV_CURRENT;
  310         ehdr.e_ident[EI_OSABI] = ELFOSABI_STANDALONE;   /* XXX big picture? */
  311         ehdr.e_type = ET_CORE;
  312         ehdr.e_machine = EM_VALUE;
  313         ehdr.e_phoff = sizeof(ehdr);
  314         ehdr.e_flags = 0;
  315         ehdr.e_ehsize = sizeof(ehdr);
  316         ehdr.e_phentsize = sizeof(Elf_Phdr);
  317         ehdr.e_shentsize = sizeof(Elf_Shdr);
  318 
  319         dumpsys_pa_init();
  320 
  321         /* Calculate dump size. */
  322         dumpsize = 0L;
  323         ehdr.e_phnum = dumpsys_foreach_chunk(cb_size, &dumpsize) +
  324             DUMPSYS_NUM_AUX_HDRS;
  325         hdrsz = ehdr.e_phoff + ehdr.e_phnum * ehdr.e_phentsize;
  326         fileofs = MD_ALIGN(hdrsz);
  327         dumpsize += fileofs;
  328         hdrgap = fileofs - roundup2((off_t)hdrsz, di->blocksize);
  329 
  330         dump_init_header(di, &kdh, KERNELDUMPMAGIC, KERNELDUMP_ARCH_VERSION,
  331             dumpsize);
  332 
  333         error = dump_start(di, &kdh);
  334         if (error != 0)
  335                 goto fail;
  336 
  337         printf("Dumping %ju MB (%d chunks)\n", (uintmax_t)dumpsize >> 20,
  338             ehdr.e_phnum - DUMPSYS_NUM_AUX_HDRS);
  339 
  340         /* Dump ELF header */
  341         error = dumpsys_buf_write(di, (char*)&ehdr, sizeof(ehdr));
  342         if (error)
  343                 goto fail;
  344 
  345         /* Dump program headers */
  346         error = dumpsys_foreach_chunk(cb_dumphdr, di);
  347         if (error < 0)
  348                 goto fail;
  349         error = dumpsys_write_aux_headers(di);
  350         if (error < 0)
  351                 goto fail;
  352         dumpsys_buf_flush(di);
  353 
  354         /*
  355          * All headers are written using blocked I/O, so we know the
  356          * current offset is (still) block aligned. Skip the alignement
  357          * in the file to have the segment contents aligned at page
  358          * boundary.
  359          */
  360         error = dumpsys_buf_seek(di, (size_t)hdrgap);
  361         if (error)
  362                 goto fail;
  363 
  364         /* Dump memory chunks. */
  365         error = dumpsys_foreach_chunk(dumpsys_cb_dumpdata, di);
  366         if (error < 0)
  367                 goto fail;
  368 
  369         error = dump_finish(di, &kdh);
  370         if (error != 0)
  371                 goto fail;
  372 
  373         printf("\nDump complete\n");
  374         return (0);
  375 
  376  fail:
  377         if (error < 0)
  378                 error = -error;
  379 
  380         if (error == ECANCELED)
  381                 printf("\nDump aborted\n");
  382         else if (error == E2BIG || error == ENOSPC)
  383                 printf("\nDump failed. Partition too small.\n");
  384         else
  385                 printf("\n** DUMP FAILED (ERROR %d) **\n", error);
  386         return (error);
  387 }
Cache object: 241c5344823066d220e1f0e97282c8de
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FreeBSD/Linux Kernel Cross Reference sys/kern/kern_dump.c

FreeBSD/Linux Kernel Cross Reference
sys/kern/kern_dump.c
