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/8.2/sys/mips/mips/dump_machdep.c 215938 2010-11-27 12:26:40Z jchandra $");
   29 
   30 #include <sys/param.h>
   31 #include <sys/systm.h>
   32 #include <sys/conf.h>
   33 #include <sys/cons.h>
   34 #include <sys/sysctl.h>
   35 #include <sys/kernel.h>
   36 #include <sys/proc.h>
   37 #include <sys/kerneldump.h>
   38 #include <vm/vm.h>
   39 #include <vm/pmap.h>
   40 #include <machine/elf.h>
   41 #include <machine/md_var.h>
   42 #include <machine/pcb.h>
   43 #include <machine/cache.h>
   44 
   45 CTASSERT(sizeof(struct kerneldumpheader) == 512);
   46 
   47 int do_minidump = 1;
   48 TUNABLE_INT("debug.minidump", &do_minidump);
   49 SYSCTL_INT(_debug, OID_AUTO, minidump, CTLFLAG_RW, &do_minidump, 0,
   50     "Enable mini crash dumps");
   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)     (((off_t)(x) + PAGE_MASK) & ~PAGE_MASK)
   59 #define DEV_ALIGN(x)    (((off_t)(x) + (DEV_BSIZE-1)) & ~(DEV_BSIZE-1))
   60 extern struct pcb dumppcb;
   61 
   62 struct md_pa {
   63         vm_paddr_t md_start;
   64         vm_paddr_t md_size;
   65 };
   66 
   67 typedef int callback_t(struct md_pa *, int, void *);
   68 
   69 static struct kerneldumpheader kdh;
   70 static off_t dumplo, fileofs;
   71 
   72 /* Handle buffered writes. */
   73 static char buffer[DEV_BSIZE];
   74 static size_t fragsz;
   75 
   76 /* XXX: I suppose 20 should be enough. */
   77 static struct md_pa dump_map[20];
   78 
   79 static void
   80 md_pa_init(void)
   81 {
   82         int n, idx;
   83 
   84         bzero(dump_map, sizeof(dump_map));
   85         for (n = 0; n < sizeof(dump_map) / sizeof(dump_map[0]); n++) {
   86                 idx = n * 2;
   87                 if (dump_avail[idx] == 0 && dump_avail[idx + 1] == 0)
   88                         break;
   89                 dump_map[n].md_start = dump_avail[idx];
   90                 dump_map[n].md_size = dump_avail[idx + 1] - dump_avail[idx];
   91         }
   92 }
   93 
   94 static struct md_pa *
   95 md_pa_first(void)
   96 {
   97 
   98         return (&dump_map[0]);
   99 }
  100 
  101 static struct md_pa *
  102 md_pa_next(struct md_pa *mdp)
  103 {
  104 
  105         mdp++;
  106         if (mdp->md_size == 0)
  107                 mdp = NULL;
  108         return (mdp);
  109 }
  110 
  111 static int
  112 buf_write(struct dumperinfo *di, char *ptr, size_t sz)
  113 {
  114         size_t len;
  115         int error;
  116 
  117         while (sz) {
  118                 len = DEV_BSIZE - fragsz;
  119                 if (len > sz)
  120                         len = sz;
  121                 bcopy(ptr, buffer + fragsz, len);
  122                 fragsz += len;
  123                 ptr += len;
  124                 sz -= len;
  125                 if (fragsz == DEV_BSIZE) {
  126                         error = dump_write(di, buffer, 0, dumplo,
  127                             DEV_BSIZE);
  128                         if (error)
  129                                 return error;
  130                         dumplo += DEV_BSIZE;
  131                         fragsz = 0;
  132                 }
  133         }
  134 
  135         return (0);
  136 }
  137 
  138 static int
  139 buf_flush(struct dumperinfo *di)
  140 {
  141         int error;
  142 
  143         if (fragsz == 0)
  144                 return (0);
  145 
  146         error = dump_write(di, buffer, 0, dumplo, DEV_BSIZE);
  147         dumplo += DEV_BSIZE;
  148         fragsz = 0;
  149         return (error);
  150 }
  151 
  152 extern vm_offset_t kernel_l1kva;
  153 extern char *pouet2;
  154 
  155 static int
  156 cb_dumpdata(struct md_pa *mdp, int seqnr, void *arg)
  157 {
  158         struct dumperinfo *di = (struct dumperinfo*)arg;
  159         vm_paddr_t pa;
  160         uint32_t pgs;
  161         size_t counter, sz, chunk;
  162         int c, error;
  163 
  164         error = 0;      /* catch case in which chunk size is 0 */
  165         counter = 0;
  166         pgs = mdp->md_size / PAGE_SIZE;
  167         pa = mdp->md_start;
  168 
  169         printf("  chunk %d: %dMB (%d pages)", seqnr, pgs * PAGE_SIZE / (
  170             1024*1024), pgs);
  171 
  172         /* Make sure we write coherent datas. */
  173         mips_dcache_wbinv_all();
  174         while (pgs) {
  175                 chunk = pgs;
  176                 if (chunk > MAXDUMPPGS)
  177                         chunk = MAXDUMPPGS;
  178                 sz = chunk << PAGE_SHIFT;
  179                 counter += sz;
  180                 if (counter >> 24) {
  181                         printf(" %d", pgs * PAGE_SIZE);
  182                         counter &= (1<<24) - 1;
  183                 }
  184 
  185                 error = dump_write(di, (void *)(pa),0, dumplo, sz);
  186                 if (error)
  187                         break;
  188                 dumplo += sz;
  189                 pgs -= chunk;
  190                 pa += sz;
  191 
  192                 /* Check for user abort. */
  193                 c = cncheckc();
  194                 if (c == 0x03)
  195                         return (ECANCELED);
  196                 if (c != -1)
  197                         printf(" (CTRL-C to abort) ");
  198         }
  199         printf(" ... %s\n", (error) ? "fail" : "ok");
  200         return (error);
  201 }
  202 
  203 static int
  204 cb_dumphdr(struct md_pa *mdp, int seqnr, void *arg)
  205 {
  206         struct dumperinfo *di = (struct dumperinfo*)arg;
  207         Elf_Phdr phdr;
  208         uint64_t size;
  209         int error;
  210 
  211         size = mdp->md_size;
  212         bzero(&phdr, sizeof(phdr));
  213         phdr.p_type = PT_LOAD;
  214         phdr.p_flags = PF_R;                    /* XXX */
  215         phdr.p_offset = fileofs;
  216         phdr.p_vaddr = mdp->md_start;
  217         phdr.p_paddr = mdp->md_start;
  218         phdr.p_filesz = size;
  219         phdr.p_memsz = size;
  220         phdr.p_align = PAGE_SIZE;
  221 
  222         error = buf_write(di, (char*)&phdr, sizeof(phdr));
  223         fileofs += phdr.p_filesz;
  224         return (error);
  225 }
  226 
  227 static int
  228 cb_size(struct md_pa *mdp, int seqnr, void *arg)
  229 {
  230         uint32_t *sz = (uint32_t*)arg;
  231 
  232         *sz += (uint32_t)mdp->md_size;
  233         return (0);
  234 }
  235 
  236 static int
  237 foreach_chunk(callback_t cb, void *arg)
  238 {
  239         struct md_pa *mdp;
  240         int error, seqnr;
  241 
  242         seqnr = 0;
  243         mdp = md_pa_first();
  244         while (mdp != NULL) {
  245                 error = (*cb)(mdp, seqnr++, arg);
  246                 if (error)
  247                         return (-error);
  248                 mdp = md_pa_next(mdp);
  249         }
  250         return (seqnr);
  251 }
  252 
  253 void
  254 dumpsys(struct dumperinfo *di)
  255 {
  256         Elf_Ehdr ehdr;
  257         uint32_t dumpsize;
  258         off_t hdrgap;
  259         size_t hdrsz;
  260         int error;
  261 
  262         if (do_minidump) {
  263                 minidumpsys(di);
  264                 return;
  265         }
  266 
  267         bzero(&ehdr, sizeof(ehdr));
  268         ehdr.e_ident[EI_MAG0] = ELFMAG0;
  269         ehdr.e_ident[EI_MAG1] = ELFMAG1;
  270         ehdr.e_ident[EI_MAG2] = ELFMAG2;
  271         ehdr.e_ident[EI_MAG3] = ELFMAG3;
  272         ehdr.e_ident[EI_CLASS] = ELF_CLASS;
  273 #if BYTE_ORDER == LITTLE_ENDIAN
  274         ehdr.e_ident[EI_DATA] = ELFDATA2LSB;
  275 #else
  276         ehdr.e_ident[EI_DATA] = ELFDATA2MSB;
  277 #endif
  278         ehdr.e_ident[EI_VERSION] = EV_CURRENT;
  279         ehdr.e_ident[EI_OSABI] = ELFOSABI_STANDALONE;   /* XXX big picture? */
  280         ehdr.e_type = ET_CORE;
  281         ehdr.e_machine = EM_MIPS;
  282         ehdr.e_phoff = sizeof(ehdr);
  283         ehdr.e_flags = 0;
  284         ehdr.e_ehsize = sizeof(ehdr);
  285         ehdr.e_phentsize = sizeof(Elf_Phdr);
  286         ehdr.e_shentsize = sizeof(Elf_Shdr);
  287 
  288         md_pa_init();
  289 
  290         /* Calculate dump size. */
  291         dumpsize = 0L;
  292         ehdr.e_phnum = foreach_chunk(cb_size, &dumpsize);
  293         hdrsz = ehdr.e_phoff + ehdr.e_phnum * ehdr.e_phentsize;
  294         fileofs = MD_ALIGN(hdrsz);
  295         dumpsize += fileofs;
  296         hdrgap = fileofs - DEV_ALIGN(hdrsz);
  297 
  298         /* Determine dump offset on device. */
  299         if (di->mediasize < SIZEOF_METADATA + dumpsize + sizeof(kdh) * 2) {
  300                 error = ENOSPC;
  301                 goto fail;
  302         }
  303         dumplo = di->mediaoffset + di->mediasize - dumpsize;
  304         dumplo -= sizeof(kdh) * 2;
  305 
  306         mkdumpheader(&kdh, KERNELDUMPMAGIC, KERNELDUMP_MIPS_VERSION, dumpsize, di->blocksize);
  307 
  308         printf("Dumping %llu MB (%d chunks)\n", (long long)dumpsize >> 20,
  309             ehdr.e_phnum);
  310 
  311         /* Dump leader */
  312         error = dump_write(di, &kdh, 0, dumplo, sizeof(kdh));
  313         if (error)
  314                 goto fail;
  315         dumplo += sizeof(kdh);
  316 
  317         /* Dump ELF header */
  318         error = buf_write(di, (char*)&ehdr, sizeof(ehdr));
  319         if (error)
  320                 goto fail;
  321 
  322         /* Dump program headers */
  323         error = foreach_chunk(cb_dumphdr, di);
  324         if (error < 0)
  325                 goto fail;
  326         buf_flush(di);
  327 
  328         /*
  329          * All headers are written using blocked I/O, so we know the
  330          * current offset is (still) block aligned. Skip the alignement
  331          * in the file to have the segment contents aligned at page
  332          * boundary. We cannot use MD_ALIGN on dumplo, because we don't
  333          * care and may very well be unaligned within the dump device.
  334          */
  335         dumplo += hdrgap;
  336 
  337         /* Dump memory chunks (updates dumplo) */
  338         error = foreach_chunk(cb_dumpdata, di);
  339         if (error < 0)
  340                 goto fail;
  341 
  342         /* Dump trailer */
  343         error = dump_write(di, &kdh, 0, dumplo, sizeof(kdh));
  344         if (error)
  345                 goto fail;
  346 
  347         /* Signal completion, signoff and exit stage left. */
  348         dump_write(di, NULL, 0, 0, 0);
  349         printf("\nDump complete\n");
  350         return;
  351 
  352  fail:
  353         if (error < 0)
  354                 error = -error;
  355 
  356         if (error == ECANCELED)
  357                 printf("\nDump aborted\n");
  358         else if (error == ENOSPC)
  359                 printf("\nDump failed. Partition too small.\n");
  360         else
  361                 printf("\n** DUMP FAILED (ERROR %d) **\n", error);
  362 }
Cache object: 79b4c994f12e023121c8636efb1339e2
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FreeBSD/Linux Kernel Cross Reference sys/mips/mips/dump_machdep.c

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sys/mips/mips/dump_machdep.c
