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("$FreeBSD$");
   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/armreg.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         cpu_idcache_wbinv_all();
  179 #ifdef __XSCALE__
  180         xscale_cache_clean_minidata();
  181 #endif
  182         while (pgs) {
  183                 chunk = pgs;
  184                 if (chunk > MAXDUMPPGS)
  185                         chunk = MAXDUMPPGS;
  186                 sz = chunk << PAGE_SHIFT;
  187                 counter += sz;
  188                 if (counter >> 24) {
  189                         printf(" %d", pgs * PAGE_SIZE);
  190                         counter &= (1<<24) - 1;
  191                 }
  192                 if (pa == (pa & L1_ADDR_BITS)) {
  193                         pmap_kenter_section(0, pa & L1_ADDR_BITS, 0);
  194                         cpu_tlb_flushID_SE(0);
  195                         cpu_cpwait();
  196                 }
  197 #ifdef SW_WATCHDOG
  198                 wdog_kern_pat(WD_LASTVAL);
  199 #endif
  200                 error = dump_write(di, 
  201                     (void *)(pa - (pa & L1_ADDR_BITS)),0, dumplo, sz);
  202                 if (error)
  203                         break;
  204                 dumplo += sz;
  205                 pgs -= chunk;
  206                 pa += sz;
  207 
  208                 /* Check for user abort. */
  209                 c = cncheckc();
  210                 if (c == 0x03)
  211                         return (ECANCELED);
  212                 if (c != -1)
  213                         printf(" (CTRL-C to abort) ");
  214         }
  215         printf(" ... %s\n", (error) ? "fail" : "ok");
  216         return (error);
  217 }
  218 
  219 static int
  220 cb_dumphdr(struct md_pa *mdp, int seqnr, void *arg)
  221 {
  222         struct dumperinfo *di = (struct dumperinfo*)arg;
  223         Elf_Phdr phdr;
  224         uint64_t size;
  225         int error;
  226 
  227         size = mdp->md_size;
  228         bzero(&phdr, sizeof(phdr));
  229         phdr.p_type = PT_LOAD;
  230         phdr.p_flags = PF_R;                    /* XXX */
  231         phdr.p_offset = fileofs;
  232         phdr.p_vaddr = mdp->md_start;
  233         phdr.p_paddr = mdp->md_start;
  234         phdr.p_filesz = size;
  235         phdr.p_memsz = size;
  236         phdr.p_align = PAGE_SIZE;
  237 
  238         error = buf_write(di, (char*)&phdr, sizeof(phdr));
  239         fileofs += phdr.p_filesz;
  240         return (error);
  241 }
  242 
  243 static int
  244 cb_size(struct md_pa *mdp, int seqnr, void *arg)
  245 {
  246         uint32_t *sz = (uint32_t*)arg;
  247 
  248         *sz += (uint32_t)mdp->md_size;
  249         return (0);
  250 }
  251 
  252 static int
  253 foreach_chunk(callback_t cb, void *arg)
  254 {
  255         struct md_pa *mdp;
  256         int error, seqnr;
  257 
  258         seqnr = 0;
  259         mdp = md_pa_first();
  260         while (mdp != NULL) {
  261                 error = (*cb)(mdp, seqnr++, arg);
  262                 if (error)
  263                         return (-error);
  264                 mdp = md_pa_next(mdp);
  265         }
  266         return (seqnr);
  267 }
  268 
  269 void
  270 dumpsys(struct dumperinfo *di)
  271 {
  272         Elf_Ehdr ehdr;
  273         uint32_t dumpsize;
  274         off_t hdrgap;
  275         size_t hdrsz;
  276         int error;
  277 
  278         if (do_minidump) {
  279                 minidumpsys(di);
  280                 return;
  281         }
  282 
  283         bzero(&ehdr, sizeof(ehdr));
  284         ehdr.e_ident[EI_MAG0] = ELFMAG0;
  285         ehdr.e_ident[EI_MAG1] = ELFMAG1;
  286         ehdr.e_ident[EI_MAG2] = ELFMAG2;
  287         ehdr.e_ident[EI_MAG3] = ELFMAG3;
  288         ehdr.e_ident[EI_CLASS] = ELF_CLASS;
  289 #if BYTE_ORDER == LITTLE_ENDIAN
  290         ehdr.e_ident[EI_DATA] = ELFDATA2LSB;
  291 #else
  292         ehdr.e_ident[EI_DATA] = ELFDATA2MSB;
  293 #endif
  294         ehdr.e_ident[EI_VERSION] = EV_CURRENT;
  295         ehdr.e_ident[EI_OSABI] = ELFOSABI_STANDALONE;   /* XXX big picture? */
  296         ehdr.e_type = ET_CORE;
  297         ehdr.e_machine = EM_ARM;
  298         ehdr.e_phoff = sizeof(ehdr);
  299         ehdr.e_flags = 0;
  300         ehdr.e_ehsize = sizeof(ehdr);
  301         ehdr.e_phentsize = sizeof(Elf_Phdr);
  302         ehdr.e_shentsize = sizeof(Elf_Shdr);
  303 
  304         md_pa_init();
  305 
  306         /* Calculate dump size. */
  307         dumpsize = 0L;
  308         ehdr.e_phnum = foreach_chunk(cb_size, &dumpsize);
  309         hdrsz = ehdr.e_phoff + ehdr.e_phnum * ehdr.e_phentsize;
  310         fileofs = MD_ALIGN(hdrsz);
  311         dumpsize += fileofs;
  312         hdrgap = fileofs - DEV_ALIGN(hdrsz);
  313 
  314         /* Determine dump offset on device. */
  315         if (di->mediasize < SIZEOF_METADATA + dumpsize + sizeof(kdh) * 2) {
  316                 error = ENOSPC;
  317                 goto fail;
  318         }
  319         dumplo = di->mediaoffset + di->mediasize - dumpsize;
  320         dumplo -= sizeof(kdh) * 2;
  321 
  322         mkdumpheader(&kdh, KERNELDUMPMAGIC, KERNELDUMP_ARM_VERSION, dumpsize, di->blocksize);
  323 
  324         printf("Dumping %llu MB (%d chunks)\n", (long long)dumpsize >> 20,
  325             ehdr.e_phnum);
  326 
  327         /* Dump leader */
  328         error = dump_write(di, &kdh, 0, dumplo, sizeof(kdh));
  329         if (error)
  330                 goto fail;
  331         dumplo += sizeof(kdh);
  332 
  333         /* Dump ELF header */
  334         error = buf_write(di, (char*)&ehdr, sizeof(ehdr));
  335         if (error)
  336                 goto fail;
  337 
  338         /* Dump program headers */
  339         error = foreach_chunk(cb_dumphdr, di);
  340         if (error < 0)
  341                 goto fail;
  342         buf_flush(di);
  343 
  344         /*
  345          * All headers are written using blocked I/O, so we know the
  346          * current offset is (still) block aligned. Skip the alignement
  347          * in the file to have the segment contents aligned at page
  348          * boundary. We cannot use MD_ALIGN on dumplo, because we don't
  349          * care and may very well be unaligned within the dump device.
  350          */
  351         dumplo += hdrgap;
  352 
  353         /* Dump memory chunks (updates dumplo) */
  354         error = foreach_chunk(cb_dumpdata, di);
  355         if (error < 0)
  356                 goto fail;
  357 
  358         /* Dump trailer */
  359         error = dump_write(di, &kdh, 0, dumplo, sizeof(kdh));
  360         if (error)
  361                 goto fail;
  362 
  363         /* Signal completion, signoff and exit stage left. */
  364         dump_write(di, NULL, 0, 0, 0);
  365         printf("\nDump complete\n");
  366         return;
  367 
  368  fail:
  369         if (error < 0)
  370                 error = -error;
  371 
  372         if (error == ECANCELED)
  373                 printf("\nDump aborted\n");
  374         else if (error == ENOSPC)
  375                 printf("\nDump failed. Partition too small.\n");
  376         else
  377                 printf("\n** DUMP FAILED (ERROR %d) **\n", error);
  378 }
Cache object: e8c415a45b320f1463010d2aa0ce3ede
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FreeBSD/Linux Kernel Cross Reference sys/arm/arm/dump_machdep.c

FreeBSD/Linux Kernel Cross Reference
sys/arm/arm/dump_machdep.c
