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: releng/11.0/sys/kern/kern_dump.c 298310 2016-04-19 23:48:27Z pfg $");
   29 
   30 #include "opt_watchdog.h"
   31 
   32 #include <sys/param.h>
   33 #include <sys/systm.h>
   34 #include <sys/conf.h>
   35 #include <sys/cons.h>
   36 #include <sys/kernel.h>
   37 #include <sys/proc.h>
   38 #include <sys/kerneldump.h>
   39 #ifdef SW_WATCHDOG
   40 #include <sys/watchdog.h>
   41 #endif
   42 #include <vm/vm.h>
   43 #include <vm/vm_param.h>
   44 #include <vm/pmap.h>
   45 #include <machine/dump.h>
   46 #include <machine/elf.h>
   47 #include <machine/md_var.h>
   48 #include <machine/pcb.h>
   49 
   50 CTASSERT(sizeof(struct kerneldumpheader) == 512);
   51 
   52 /*
   53  * Don't touch the first SIZEOF_METADATA bytes on the dump device. This
   54  * is to protect us from metadata and to protect metadata from us.
   55  */
   56 #define SIZEOF_METADATA         (64*1024)
   57 
   58 #define MD_ALIGN(x)     roundup2((off_t)(x), PAGE_SIZE)
   59 
   60 off_t dumplo;
   61 
   62 /* Handle buffered writes. */
   63 static size_t fragsz;
   64 
   65 struct dump_pa dump_map[DUMPSYS_MD_PA_NPAIRS];
   66 
   67 #if !defined(__powerpc__) && !defined(__sparc__)
   68 void
   69 dumpsys_gen_pa_init(void)
   70 {
   71         int n, idx;
   72 
   73         bzero(dump_map, sizeof(dump_map));
   74         for (n = 0; n < nitems(dump_map); n++) {
   75                 idx = n * 2;
   76                 if (dump_avail[idx] == 0 && dump_avail[idx + 1] == 0)
   77                         break;
   78                 dump_map[n].pa_start = dump_avail[idx];
   79                 dump_map[n].pa_size = dump_avail[idx + 1] - dump_avail[idx];
   80         }
   81 }
   82 #endif
   83 
   84 struct dump_pa *
   85 dumpsys_gen_pa_next(struct dump_pa *mdp)
   86 {
   87 
   88         if (mdp == NULL)
   89                 return (&dump_map[0]);
   90 
   91         mdp++;
   92         if (mdp->pa_size == 0)
   93                 mdp = NULL;
   94         return (mdp);
   95 }
   96 
   97 void
   98 dumpsys_gen_wbinv_all(void)
   99 {
  100 
  101 }
  102 
  103 void
  104 dumpsys_gen_unmap_chunk(vm_paddr_t pa __unused, size_t chunk __unused,
  105     void *va __unused)
  106 {
  107 
  108 }
  109 
  110 #if !defined(__sparc__)
  111 int
  112 dumpsys_gen_write_aux_headers(struct dumperinfo *di)
  113 {
  114 
  115         return (0);
  116 }
  117 #endif
  118 
  119 int
  120 dumpsys_buf_write(struct dumperinfo *di, char *ptr, size_t sz)
  121 {
  122         size_t len;
  123         int error;
  124 
  125         while (sz) {
  126                 len = di->blocksize - fragsz;
  127                 if (len > sz)
  128                         len = sz;
  129                 memcpy((char *)di->blockbuf + fragsz, ptr, len);
  130                 fragsz += len;
  131                 ptr += len;
  132                 sz -= len;
  133                 if (fragsz == di->blocksize) {
  134                         error = dump_write(di, di->blockbuf, 0, dumplo,
  135                             di->blocksize);
  136                         if (error)
  137                                 return (error);
  138                         dumplo += di->blocksize;
  139                         fragsz = 0;
  140                 }
  141         }
  142         return (0);
  143 }
  144 
  145 int
  146 dumpsys_buf_flush(struct dumperinfo *di)
  147 {
  148         int error;
  149 
  150         if (fragsz == 0)
  151                 return (0);
  152 
  153         error = dump_write(di, di->blockbuf, 0, dumplo, di->blocksize);
  154         dumplo += di->blocksize;
  155         fragsz = 0;
  156         return (error);
  157 }
  158 
  159 CTASSERT(PAGE_SHIFT < 20);
  160 #define PG2MB(pgs) ((pgs + (1 << (20 - PAGE_SHIFT)) - 1) >> (20 - PAGE_SHIFT))
  161 
  162 int
  163 dumpsys_cb_dumpdata(struct dump_pa *mdp, int seqnr, void *arg)
  164 {
  165         struct dumperinfo *di = (struct dumperinfo*)arg;
  166         vm_paddr_t pa;
  167         void *va;
  168         uint64_t pgs;
  169         size_t counter, sz, chunk;
  170         int c, error;
  171         u_int maxdumppgs;
  172 
  173         error = 0;      /* catch case in which chunk size is 0 */
  174         counter = 0;    /* Update twiddle every 16MB */
  175         va = NULL;
  176         pgs = mdp->pa_size / PAGE_SIZE;
  177         pa = mdp->pa_start;
  178         maxdumppgs = min(di->maxiosize / PAGE_SIZE, MAXDUMPPGS);
  179         if (maxdumppgs == 0)    /* seatbelt */
  180                 maxdumppgs = 1;
  181 
  182         printf("  chunk %d: %juMB (%ju pages)", seqnr, (uintmax_t)PG2MB(pgs),
  183             (uintmax_t)pgs);
  184 
  185         dumpsys_wbinv_all();
  186         while (pgs) {
  187                 chunk = pgs;
  188                 if (chunk > maxdumppgs)
  189                         chunk = maxdumppgs;
  190                 sz = chunk << PAGE_SHIFT;
  191                 counter += sz;
  192                 if (counter >> 24) {
  193                         printf(" %ju", (uintmax_t)PG2MB(pgs));
  194                         counter &= (1 << 24) - 1;
  195                 }
  196 
  197                 dumpsys_map_chunk(pa, chunk, &va);
  198 #ifdef SW_WATCHDOG
  199                 wdog_kern_pat(WD_LASTVAL);
  200 #endif
  201 
  202                 error = dump_write(di, va, 0, dumplo, sz);
  203                 dumpsys_unmap_chunk(pa, chunk, va);
  204                 if (error)
  205                         break;
  206                 dumplo += sz;
  207                 pgs -= chunk;
  208                 pa += sz;
  209 
  210                 /* Check for user abort. */
  211                 c = cncheckc();
  212                 if (c == 0x03)
  213                         return (ECANCELED);
  214                 if (c != -1)
  215                         printf(" (CTRL-C to abort) ");
  216         }
  217         printf(" ... %s\n", (error) ? "fail" : "ok");
  218         return (error);
  219 }
  220 
  221 int
  222 dumpsys_foreach_chunk(dumpsys_callback_t cb, void *arg)
  223 {
  224         struct dump_pa *mdp;
  225         int error, seqnr;
  226 
  227         seqnr = 0;
  228         mdp = dumpsys_pa_next(NULL);
  229         while (mdp != NULL) {
  230                 error = (*cb)(mdp, seqnr++, arg);
  231                 if (error)
  232                         return (-error);
  233                 mdp = dumpsys_pa_next(mdp);
  234         }
  235         return (seqnr);
  236 }
  237 
  238 #if !defined(__sparc__)
  239 static off_t fileofs;
  240 
  241 static int
  242 cb_dumphdr(struct dump_pa *mdp, int seqnr, void *arg)
  243 {
  244         struct dumperinfo *di = (struct dumperinfo*)arg;
  245         Elf_Phdr phdr;
  246         uint64_t size;
  247         int error;
  248 
  249         size = mdp->pa_size;
  250         bzero(&phdr, sizeof(phdr));
  251         phdr.p_type = PT_LOAD;
  252         phdr.p_flags = PF_R;                    /* XXX */
  253         phdr.p_offset = fileofs;
  254 #ifdef __powerpc__
  255         phdr.p_vaddr = (do_minidump? mdp->pa_start : ~0L);
  256         phdr.p_paddr = (do_minidump? ~0L : mdp->pa_start);
  257 #else
  258         phdr.p_vaddr = mdp->pa_start;
  259         phdr.p_paddr = mdp->pa_start;
  260 #endif
  261         phdr.p_filesz = size;
  262         phdr.p_memsz = size;
  263         phdr.p_align = PAGE_SIZE;
  264 
  265         error = dumpsys_buf_write(di, (char*)&phdr, sizeof(phdr));
  266         fileofs += phdr.p_filesz;
  267         return (error);
  268 }
  269 
  270 static int
  271 cb_size(struct dump_pa *mdp, int seqnr, void *arg)
  272 {
  273         uint64_t *sz;
  274 
  275         sz = (uint64_t *)arg;
  276         *sz += (uint64_t)mdp->pa_size;
  277         return (0);
  278 }
  279 
  280 int
  281 dumpsys_generic(struct dumperinfo *di)
  282 {
  283         static struct kerneldumpheader kdh;
  284         Elf_Ehdr ehdr;
  285         uint64_t dumpsize;
  286         off_t hdrgap;
  287         size_t hdrsz, size;
  288         int error;
  289 
  290 #ifndef __powerpc__
  291         if (do_minidump)
  292                 return (minidumpsys(di));
  293 #endif
  294 
  295         bzero(&ehdr, sizeof(ehdr));
  296         ehdr.e_ident[EI_MAG0] = ELFMAG0;
  297         ehdr.e_ident[EI_MAG1] = ELFMAG1;
  298         ehdr.e_ident[EI_MAG2] = ELFMAG2;
  299         ehdr.e_ident[EI_MAG3] = ELFMAG3;
  300         ehdr.e_ident[EI_CLASS] = ELF_CLASS;
  301 #if BYTE_ORDER == LITTLE_ENDIAN
  302         ehdr.e_ident[EI_DATA] = ELFDATA2LSB;
  303 #else
  304         ehdr.e_ident[EI_DATA] = ELFDATA2MSB;
  305 #endif
  306         ehdr.e_ident[EI_VERSION] = EV_CURRENT;
  307         ehdr.e_ident[EI_OSABI] = ELFOSABI_STANDALONE;   /* XXX big picture? */
  308         ehdr.e_type = ET_CORE;
  309         ehdr.e_machine = EM_VALUE;
  310         ehdr.e_phoff = sizeof(ehdr);
  311         ehdr.e_flags = 0;
  312         ehdr.e_ehsize = sizeof(ehdr);
  313         ehdr.e_phentsize = sizeof(Elf_Phdr);
  314         ehdr.e_shentsize = sizeof(Elf_Shdr);
  315 
  316         dumpsys_pa_init();
  317 
  318         /* Calculate dump size. */
  319         dumpsize = 0L;
  320         ehdr.e_phnum = dumpsys_foreach_chunk(cb_size, &dumpsize) +
  321             DUMPSYS_NUM_AUX_HDRS;
  322         hdrsz = ehdr.e_phoff + ehdr.e_phnum * ehdr.e_phentsize;
  323         fileofs = MD_ALIGN(hdrsz);
  324         dumpsize += fileofs;
  325         hdrgap = fileofs - roundup2((off_t)hdrsz, di->blocksize);
  326 
  327         /* Determine dump offset on device. */
  328         if (di->mediasize < SIZEOF_METADATA + dumpsize + di->blocksize * 2) {
  329                 error = ENOSPC;
  330                 goto fail;
  331         }
  332         dumplo = di->mediaoffset + di->mediasize - dumpsize;
  333         dumplo -= di->blocksize * 2;
  334 
  335         mkdumpheader(&kdh, KERNELDUMPMAGIC, KERNELDUMP_ARCH_VERSION, dumpsize,
  336             di->blocksize);
  337 
  338         printf("Dumping %ju MB (%d chunks)\n", (uintmax_t)dumpsize >> 20,
  339             ehdr.e_phnum - DUMPSYS_NUM_AUX_HDRS);
  340 
  341         /* Dump leader */
  342         error = dump_write_pad(di, &kdh, 0, dumplo, sizeof(kdh), &size);
  343         if (error)
  344                 goto fail;
  345         dumplo += size;
  346 
  347         /* Dump ELF header */
  348         error = dumpsys_buf_write(di, (char*)&ehdr, sizeof(ehdr));
  349         if (error)
  350                 goto fail;
  351 
  352         /* Dump program headers */
  353         error = dumpsys_foreach_chunk(cb_dumphdr, di);
  354         if (error < 0)
  355                 goto fail;
  356         error = dumpsys_write_aux_headers(di);
  357         if (error < 0)
  358                 goto fail;
  359         dumpsys_buf_flush(di);
  360 
  361         /*
  362          * All headers are written using blocked I/O, so we know the
  363          * current offset is (still) block aligned. Skip the alignement
  364          * in the file to have the segment contents aligned at page
  365          * boundary. We cannot use MD_ALIGN on dumplo, because we don't
  366          * care and may very well be unaligned within the dump device.
  367          */
  368         dumplo += hdrgap;
  369 
  370         /* Dump memory chunks (updates dumplo) */
  371         error = dumpsys_foreach_chunk(dumpsys_cb_dumpdata, di);
  372         if (error < 0)
  373                 goto fail;
  374 
  375         /* Dump trailer */
  376         error = dump_write_pad(di, &kdh, 0, dumplo, sizeof(kdh), &size);
  377         if (error)
  378                 goto fail;
  379 
  380         /* Signal completion, signoff and exit stage left. */
  381         dump_write(di, NULL, 0, 0, 0);
  382         printf("\nDump complete\n");
  383         return (0);
  384 
  385  fail:
  386         if (error < 0)
  387                 error = -error;
  388 
  389         if (error == ECANCELED)
  390                 printf("\nDump aborted\n");
  391         else if (error == ENOSPC)
  392                 printf("\nDump failed. Partition too small.\n");
  393         else
  394                 printf("\n** DUMP FAILED (ERROR %d) **\n", error);
  395         return (error);
  396 }
  397 #endif
Cache object: f59c3bdc22d5e612d62175c82cad9499
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FreeBSD/Linux Kernel Cross Reference sys/kern/kern_dump.c

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