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/mips/mips/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: stable/8/sys/mips/mips/dump_machdep.c 221939 2011-05-15 01:08:51Z attilio $");
   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/sysctl.h>
   37 #include <sys/kernel.h>
   38 #include <sys/proc.h>
   39 #include <sys/kerneldump.h>
   40 #ifdef SW_WATCHDOG
   41 #include <sys/watchdog.h>
   42 #endif
   43 #include <vm/vm.h>
   44 #include <vm/pmap.h>
   45 #include <machine/elf.h>
   46 #include <machine/md_var.h>
   47 #include <machine/pcb.h>
   48 #include <machine/cache.h>
   49 
   50 CTASSERT(sizeof(struct kerneldumpheader) == 512);
   51 
   52 int do_minidump = 1;
   53 TUNABLE_INT("debug.minidump", &do_minidump);
   54 SYSCTL_INT(_debug, OID_AUTO, minidump, CTLFLAG_RW, &do_minidump, 0,
   55     "Enable mini crash dumps");
   56 
   57 /*
   58  * Don't touch the first SIZEOF_METADATA bytes on the dump device. This
   59  * is to protect us from metadata and to protect metadata from us.
   60  */
   61 #define SIZEOF_METADATA         (64*1024)
   62 
   63 #define MD_ALIGN(x)     (((off_t)(x) + PAGE_MASK) & ~PAGE_MASK)
   64 #define DEV_ALIGN(x)    (((off_t)(x) + (DEV_BSIZE-1)) & ~(DEV_BSIZE-1))
   65 extern struct pcb dumppcb;
   66 
   67 struct md_pa {
   68         vm_paddr_t md_start;
   69         vm_paddr_t md_size;
   70 };
   71 
   72 typedef int callback_t(struct md_pa *, int, void *);
   73 
   74 static struct kerneldumpheader kdh;
   75 static off_t dumplo, fileofs;
   76 
   77 /* Handle buffered writes. */
   78 static char buffer[DEV_BSIZE];
   79 static size_t fragsz;
   80 
   81 /* XXX: I suppose 20 should be enough. */
   82 static struct md_pa dump_map[20];
   83 
   84 static void
   85 md_pa_init(void)
   86 {
   87         int n, idx;
   88 
   89         bzero(dump_map, sizeof(dump_map));
   90         for (n = 0; n < sizeof(dump_map) / sizeof(dump_map[0]); n++) {
   91                 idx = n * 2;
   92                 if (dump_avail[idx] == 0 && dump_avail[idx + 1] == 0)
   93                         break;
   94                 dump_map[n].md_start = dump_avail[idx];
   95                 dump_map[n].md_size = dump_avail[idx + 1] - dump_avail[idx];
   96         }
   97 }
   98 
   99 static struct md_pa *
  100 md_pa_first(void)
  101 {
  102 
  103         return (&dump_map[0]);
  104 }
  105 
  106 static struct md_pa *
  107 md_pa_next(struct md_pa *mdp)
  108 {
  109 
  110         mdp++;
  111         if (mdp->md_size == 0)
  112                 mdp = NULL;
  113         return (mdp);
  114 }
  115 
  116 static int
  117 buf_write(struct dumperinfo *di, char *ptr, size_t sz)
  118 {
  119         size_t len;
  120         int error;
  121 
  122         while (sz) {
  123                 len = DEV_BSIZE - fragsz;
  124                 if (len > sz)
  125                         len = sz;
  126                 bcopy(ptr, buffer + fragsz, len);
  127                 fragsz += len;
  128                 ptr += len;
  129                 sz -= len;
  130                 if (fragsz == DEV_BSIZE) {
  131                         error = dump_write(di, buffer, 0, dumplo,
  132                             DEV_BSIZE);
  133                         if (error)
  134                                 return error;
  135                         dumplo += DEV_BSIZE;
  136                         fragsz = 0;
  137                 }
  138         }
  139 
  140         return (0);
  141 }
  142 
  143 static int
  144 buf_flush(struct dumperinfo *di)
  145 {
  146         int error;
  147 
  148         if (fragsz == 0)
  149                 return (0);
  150 
  151         error = dump_write(di, buffer, 0, dumplo, DEV_BSIZE);
  152         dumplo += DEV_BSIZE;
  153         fragsz = 0;
  154         return (error);
  155 }
  156 
  157 extern vm_offset_t kernel_l1kva;
  158 extern char *pouet2;
  159 
  160 static int
  161 cb_dumpdata(struct md_pa *mdp, int seqnr, void *arg)
  162 {
  163         struct dumperinfo *di = (struct dumperinfo*)arg;
  164         vm_paddr_t pa;
  165         uint32_t pgs;
  166         size_t counter, sz, chunk;
  167         int c, error;
  168 
  169         error = 0;      /* catch case in which chunk size is 0 */
  170         counter = 0;
  171         pgs = mdp->md_size / PAGE_SIZE;
  172         pa = mdp->md_start;
  173 
  174         printf("  chunk %d: %dMB (%d pages)", seqnr, pgs * PAGE_SIZE / (
  175             1024*1024), pgs);
  176 
  177         /* Make sure we write coherent datas. */
  178         mips_dcache_wbinv_all();
  179         while (pgs) {
  180                 chunk = pgs;
  181                 if (chunk > MAXDUMPPGS)
  182                         chunk = MAXDUMPPGS;
  183                 sz = chunk << PAGE_SHIFT;
  184                 counter += sz;
  185                 if (counter >> 24) {
  186                         printf(" %d", pgs * PAGE_SIZE);
  187                         counter &= (1<<24) - 1;
  188                 }
  189 
  190 #ifdef SW_WATCHDOG
  191                 wdog_kern_path(WD_LASTVAL);
  192 #endif
  193                 error = dump_write(di, (void *)(pa),0, dumplo, sz);
  194                 if (error)
  195                         break;
  196                 dumplo += sz;
  197                 pgs -= chunk;
  198                 pa += sz;
  199 
  200                 /* Check for user abort. */
  201                 c = cncheckc();
  202                 if (c == 0x03)
  203                         return (ECANCELED);
  204                 if (c != -1)
  205                         printf(" (CTRL-C to abort) ");
  206         }
  207         printf(" ... %s\n", (error) ? "fail" : "ok");
  208         return (error);
  209 }
  210 
  211 static int
  212 cb_dumphdr(struct md_pa *mdp, int seqnr, void *arg)
  213 {
  214         struct dumperinfo *di = (struct dumperinfo*)arg;
  215         Elf_Phdr phdr;
  216         uint64_t size;
  217         int error;
  218 
  219         size = mdp->md_size;
  220         bzero(&phdr, sizeof(phdr));
  221         phdr.p_type = PT_LOAD;
  222         phdr.p_flags = PF_R;                    /* XXX */
  223         phdr.p_offset = fileofs;
  224         phdr.p_vaddr = mdp->md_start;
  225         phdr.p_paddr = mdp->md_start;
  226         phdr.p_filesz = size;
  227         phdr.p_memsz = size;
  228         phdr.p_align = PAGE_SIZE;
  229 
  230         error = buf_write(di, (char*)&phdr, sizeof(phdr));
  231         fileofs += phdr.p_filesz;
  232         return (error);
  233 }
  234 
  235 static int
  236 cb_size(struct md_pa *mdp, int seqnr, void *arg)
  237 {
  238         uint32_t *sz = (uint32_t*)arg;
  239 
  240         *sz += (uint32_t)mdp->md_size;
  241         return (0);
  242 }
  243 
  244 static int
  245 foreach_chunk(callback_t cb, void *arg)
  246 {
  247         struct md_pa *mdp;
  248         int error, seqnr;
  249 
  250         seqnr = 0;
  251         mdp = md_pa_first();
  252         while (mdp != NULL) {
  253                 error = (*cb)(mdp, seqnr++, arg);
  254                 if (error)
  255                         return (-error);
  256                 mdp = md_pa_next(mdp);
  257         }
  258         return (seqnr);
  259 }
  260 
  261 void
  262 dumpsys(struct dumperinfo *di)
  263 {
  264         Elf_Ehdr ehdr;
  265         uint32_t dumpsize;
  266         off_t hdrgap;
  267         size_t hdrsz;
  268         int error;
  269 
  270         if (do_minidump) {
  271                 minidumpsys(di);
  272                 return;
  273         }
  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_MIPS;
  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, KERNELDUMPMAGIC, KERNELDUMP_MIPS_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 = dump_write(di, &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 = dump_write(di, &kdh, 0, dumplo, sizeof(kdh));
  352         if (error)
  353                 goto fail;
  354 
  355         /* Signal completion, signoff and exit stage left. */
  356         dump_write(di, 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: f68be3deaf05a17ee104d6b1b21579a3


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