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/arm/arm/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 <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 <vm/vm.h>
   38 #include <vm/pmap.h>
   39 #include <machine/elf.h>
   40 #include <machine/md_var.h>
   41 #include <machine/pcb.h>
   42 #include <machine/armreg.h>
   43 
   44 CTASSERT(sizeof(struct kerneldumpheader) == 512);
   45 
   46 /*
   47  * Don't touch the first SIZEOF_METADATA bytes on the dump device. This
   48  * is to protect us from metadata and to protect metadata from us.
   49  */
   50 #define SIZEOF_METADATA         (64*1024)
   51 
   52 #define MD_ALIGN(x)     (((off_t)(x) + PAGE_MASK) & ~PAGE_MASK)
   53 #define DEV_ALIGN(x)    (((off_t)(x) + (DEV_BSIZE-1)) & ~(DEV_BSIZE-1))
   54 extern struct pcb dumppcb;
   55 
   56 struct md_pa {
   57         vm_paddr_t md_start;
   58         vm_paddr_t md_size;
   59 };
   60 
   61 typedef int callback_t(struct md_pa *, int, void *);
   62 
   63 static struct kerneldumpheader kdh;
   64 static off_t dumplo, fileofs;
   65 
   66 /* Handle buffered writes. */
   67 static char buffer[DEV_BSIZE];
   68 static size_t fragsz;
   69 
   70 /* XXX: I suppose 20 should be enough. */
   71 static struct md_pa dump_map[20];
   72 
   73 static void
   74 md_pa_init(void)
   75 {
   76         int n, idx;
   77 
   78         bzero(dump_map, sizeof(dump_map));
   79         for (n = 0; n < sizeof(dump_map) / sizeof(dump_map[0]); n++) {
   80                 idx = n * 2;
   81                 if (dump_avail[idx] == 0 && dump_avail[idx + 1] == 0)
   82                         break;
   83                 dump_map[n].md_start = dump_avail[idx];
   84                 dump_map[n].md_size = dump_avail[idx + 1] - dump_avail[idx];
   85         }
   86 }
   87 
   88 static struct md_pa *
   89 md_pa_first(void)
   90 {
   91 
   92         return (&dump_map[0]);
   93 }
   94 
   95 static struct md_pa *
   96 md_pa_next(struct md_pa *mdp)
   97 {
   98 
   99         mdp++;
  100         if (mdp->md_size == 0)
  101                 mdp = NULL;
  102         return (mdp);
  103 }
  104 
  105 /* XXX should be MI */
  106 static void
  107 mkdumpheader(struct kerneldumpheader *kdh, uint32_t archver, uint64_t dumplen,
  108     uint32_t blksz)
  109 {
  110 
  111         bzero(kdh, sizeof(*kdh));
  112         strncpy(kdh->magic, KERNELDUMPMAGIC, sizeof(kdh->magic));
  113         strncpy(kdh->architecture, MACHINE_ARCH, sizeof(kdh->architecture));
  114         kdh->version = htod32(KERNELDUMPVERSION);
  115         kdh->architectureversion = htod32(archver);
  116         kdh->dumplength = htod64(dumplen);
  117         kdh->dumptime = htod64(time_second);
  118         kdh->blocksize = htod32(blksz);
  119         strncpy(kdh->hostname, hostname, sizeof(kdh->hostname));
  120         strncpy(kdh->versionstring, version, sizeof(kdh->versionstring));
  121         if (panicstr != NULL)
  122                 strncpy(kdh->panicstring, panicstr, sizeof(kdh->panicstring));
  123         kdh->parity = kerneldump_parity(kdh);
  124 }
  125 
  126 static int
  127 buf_write(struct dumperinfo *di, char *ptr, size_t sz)
  128 {
  129         size_t len;
  130         int error;
  131 
  132         while (sz) {
  133                 len = DEV_BSIZE - fragsz;
  134                 if (len > sz)
  135                         len = sz;
  136                 bcopy(ptr, buffer + fragsz, len);
  137                 fragsz += len;
  138                 ptr += len;
  139                 sz -= len;
  140                 if (fragsz == DEV_BSIZE) {
  141                         error = dump_write(di, buffer, 0, dumplo,
  142                             DEV_BSIZE);
  143                         if (error)
  144                                 return error;
  145                         dumplo += DEV_BSIZE;
  146                         fragsz = 0;
  147                 }
  148         }
  149 
  150         return (0);
  151 }
  152 
  153 static int
  154 buf_flush(struct dumperinfo *di)
  155 {
  156         int error;
  157 
  158         if (fragsz == 0)
  159                 return (0);
  160 
  161         error = dump_write(di, buffer, 0, dumplo, DEV_BSIZE);
  162         dumplo += DEV_BSIZE;
  163         fragsz = 0;
  164         return (error);
  165 }
  166 
  167 extern vm_offset_t kernel_l1kva;
  168 extern char *pouet2;
  169 
  170 static int
  171 cb_dumpdata(struct md_pa *mdp, int seqnr, void *arg)
  172 {
  173         struct dumperinfo *di = (struct dumperinfo*)arg;
  174         vm_paddr_t pa;
  175         vm_offset_t va;
  176         uint32_t pgs;
  177         size_t counter, sz, chunk;
  178         int c, error, twiddle;
  179 
  180         error = 0;      /* catch case in which chunk size is 0 */
  181         counter = 0;    /* Update twiddle every 16MB */
  182         twiddle = 0;
  183         va = 0;
  184         pgs = mdp->md_size / PAGE_SIZE;
  185         pa = mdp->md_start;
  186 
  187         printf("  chunk %d: %dMB (%d pages)", seqnr, pgs * PAGE_SIZE / (
  188             1024*1024), pgs);
  189 
  190         /* Make sure we write coherent datas. */
  191         cpu_idcache_wbinv_all();
  192 #ifdef __XSCALE__
  193         xscale_cache_clean_minidata();
  194 #endif
  195         while (pgs) {
  196                 chunk = pgs;
  197                 if (chunk > MAXDUMPPGS)
  198                         chunk = MAXDUMPPGS;
  199                 sz = chunk << PAGE_SHIFT;
  200                 counter += sz;
  201                 if (counter >> 24) {
  202                         printf(" %d", pgs * PAGE_SIZE);
  203                         counter &= (1<<24) - 1;
  204                 }
  205                 if (pa == (pa & L1_ADDR_BITS)) {
  206                         pmap_kenter_section(0, pa & L1_ADDR_BITS, 0);
  207                         cpu_tlb_flushID_SE(0);
  208                         cpu_cpwait();
  209                 }
  210                 error = dump_write(di, 
  211                     (void *)(pa - (pa & L1_ADDR_BITS)),0, dumplo, sz);
  212                 if (error)
  213                         break;
  214                 dumplo += sz;
  215                 pgs -= chunk;
  216                 pa += sz;
  217 
  218                 /* Check for user abort. */
  219                 c = cncheckc();
  220                 if (c == 0x03)
  221                         return (ECANCELED);
  222                 if (c != -1)
  223                         printf(" (CTRL-C to abort) ");
  224         }
  225         printf(" ... %s\n", (error) ? "fail" : "ok");
  226         return (error);
  227 }
  228 
  229 static int
  230 cb_dumphdr(struct md_pa *mdp, int seqnr, void *arg)
  231 {
  232         struct dumperinfo *di = (struct dumperinfo*)arg;
  233         Elf_Phdr phdr;
  234         uint64_t size;
  235         int error;
  236 
  237         size = mdp->md_size;
  238         bzero(&phdr, sizeof(phdr));
  239         phdr.p_type = PT_LOAD;
  240         phdr.p_flags = PF_R;                    /* XXX */
  241         phdr.p_offset = fileofs;
  242         phdr.p_vaddr = mdp->md_start;
  243         phdr.p_paddr = mdp->md_start;
  244         phdr.p_filesz = size;
  245         phdr.p_memsz = size;
  246         phdr.p_align = PAGE_SIZE;
  247 
  248         error = buf_write(di, (char*)&phdr, sizeof(phdr));
  249         fileofs += phdr.p_filesz;
  250         return (error);
  251 }
  252 
  253 static int
  254 cb_size(struct md_pa *mdp, int seqnr, void *arg)
  255 {
  256         uint32_t *sz = (uint32_t*)arg;
  257 
  258         *sz += (uint32_t)mdp->md_size;
  259         return (0);
  260 }
  261 
  262 static int
  263 foreach_chunk(callback_t cb, void *arg)
  264 {
  265         struct md_pa *mdp;
  266         int error, seqnr;
  267 
  268         seqnr = 0;
  269         mdp = md_pa_first();
  270         while (mdp != NULL) {
  271                 error = (*cb)(mdp, seqnr++, arg);
  272                 if (error)
  273                         return (-error);
  274                 mdp = md_pa_next(mdp);
  275         }
  276         return (seqnr);
  277 }
  278 
  279 void
  280 dumpsys(struct dumperinfo *di)
  281 {
  282         Elf_Ehdr ehdr;
  283         uint32_t dumpsize;
  284         off_t hdrgap;
  285         size_t hdrsz;
  286         int error;
  287         
  288         bzero(&ehdr, sizeof(ehdr));
  289         ehdr.e_ident[EI_MAG0] = ELFMAG0;
  290         ehdr.e_ident[EI_MAG1] = ELFMAG1;
  291         ehdr.e_ident[EI_MAG2] = ELFMAG2;
  292         ehdr.e_ident[EI_MAG3] = ELFMAG3;
  293         ehdr.e_ident[EI_CLASS] = ELF_CLASS;
  294 #if BYTE_ORDER == LITTLE_ENDIAN
  295         ehdr.e_ident[EI_DATA] = ELFDATA2LSB;
  296 #else
  297         ehdr.e_ident[EI_DATA] = ELFDATA2MSB;
  298 #endif
  299         ehdr.e_ident[EI_VERSION] = EV_CURRENT;
  300         ehdr.e_ident[EI_OSABI] = ELFOSABI_STANDALONE;   /* XXX big picture? */
  301         ehdr.e_type = ET_CORE;
  302         ehdr.e_machine = EM_ARM;
  303         ehdr.e_phoff = sizeof(ehdr);
  304         ehdr.e_flags = 0;
  305         ehdr.e_ehsize = sizeof(ehdr);
  306         ehdr.e_phentsize = sizeof(Elf_Phdr);
  307         ehdr.e_shentsize = sizeof(Elf_Shdr);
  308 
  309         md_pa_init();
  310 
  311         /* Calculate dump size. */
  312         dumpsize = 0L;
  313         ehdr.e_phnum = foreach_chunk(cb_size, &dumpsize);
  314         hdrsz = ehdr.e_phoff + ehdr.e_phnum * ehdr.e_phentsize;
  315         fileofs = MD_ALIGN(hdrsz);
  316         dumpsize += fileofs;
  317         hdrgap = fileofs - DEV_ALIGN(hdrsz);
  318 
  319         /* Determine dump offset on device. */
  320         if (di->mediasize < SIZEOF_METADATA + dumpsize + sizeof(kdh) * 2) {
  321                 error = ENOSPC;
  322                 goto fail;
  323         }
  324         dumplo = di->mediaoffset + di->mediasize - dumpsize;
  325         dumplo -= sizeof(kdh) * 2;
  326 
  327         mkdumpheader(&kdh, KERNELDUMP_ARM_VERSION, dumpsize, di->blocksize);
  328 
  329         printf("Dumping %llu MB (%d chunks)\n", (long long)dumpsize >> 20,
  330             ehdr.e_phnum);
  331 
  332         /* Dump leader */
  333         error = dump_write(di, &kdh, 0, dumplo, sizeof(kdh));
  334         if (error)
  335                 goto fail;
  336         dumplo += sizeof(kdh);
  337 
  338         /* Dump ELF header */
  339         error = buf_write(di, (char*)&ehdr, sizeof(ehdr));
  340         if (error)
  341                 goto fail;
  342 
  343         /* Dump program headers */
  344         error = foreach_chunk(cb_dumphdr, di);
  345         if (error < 0)
  346                 goto fail;
  347         buf_flush(di);
  348 
  349         /*
  350          * All headers are written using blocked I/O, so we know the
  351          * current offset is (still) block aligned. Skip the alignement
  352          * in the file to have the segment contents aligned at page
  353          * boundary. We cannot use MD_ALIGN on dumplo, because we don't
  354          * care and may very well be unaligned within the dump device.
  355          */
  356         dumplo += hdrgap;
  357 
  358         /* Dump memory chunks (updates dumplo) */
  359         error = foreach_chunk(cb_dumpdata, di);
  360         if (error < 0)
  361                 goto fail;
  362 
  363         /* Dump trailer */
  364         error = dump_write(di, &kdh, 0, dumplo, sizeof(kdh));
  365         if (error)
  366                 goto fail;
  367 
  368         /* Signal completion, signoff and exit stage left. */
  369         dump_write(di, NULL, 0, 0, 0);
  370         printf("\nDump complete\n");
  371         return;
  372 
  373  fail:
  374         if (error < 0)
  375                 error = -error;
  376 
  377         if (error == ECANCELED)
  378                 printf("\nDump aborted\n");
  379         else if (error == ENOSPC)
  380                 printf("\nDump failed. Partition too small.\n");
  381         else
  382                 printf("\n** DUMP FAILED (ERROR %d) **\n", error);
  383 }

Cache object: 4b9f67c4c7ca70ff143cc54b963972b6


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