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/powerpc/powerpc/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/10.1/sys/powerpc/powerpc/dump_machdep.c 221173 2011-04-28 16:02:05Z 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/kernel.h>
   37 #include <sys/kerneldump.h>
   38 #include <sys/sysctl.h>
   39 #ifdef SW_WATCHDOG
   40 #include <sys/watchdog.h>
   41 #endif
   42 #include <vm/vm.h>
   43 #include <vm/pmap.h>
   44 #include <machine/elf.h>
   45 #include <machine/md_var.h>
   46 
   47 CTASSERT(sizeof(struct kerneldumpheader) == 512);
   48 
   49 /*
   50  * Don't touch the first SIZEOF_METADATA bytes on the dump device. This
   51  * is to protect us from metadata and to protect metadata from us.
   52  */
   53 #define SIZEOF_METADATA         (64*1024)
   54 
   55 #define MD_ALIGN(x)     (((off_t)(x) + PAGE_MASK) & ~PAGE_MASK)
   56 #define DEV_ALIGN(x)    (((off_t)(x) + (DEV_BSIZE-1)) & ~(DEV_BSIZE-1))
   57 
   58 typedef int callback_t(struct pmap_md *, int, void *);
   59 
   60 static struct kerneldumpheader kdh;
   61 static off_t dumplo, fileofs;
   62 
   63 /* Handle buffered writes. */
   64 static char buffer[DEV_BSIZE];
   65 static size_t fragsz;
   66 
   67 int dumpsys_minidump = 1;
   68 SYSCTL_INT(_debug, OID_AUTO, minidump, CTLFLAG_RD, &dumpsys_minidump, 0,
   69     "Kernel makes compressed crash dumps");
   70 
   71 static int
   72 buf_write(struct dumperinfo *di, char *ptr, size_t sz)
   73 {
   74         size_t len;
   75         int error;
   76 
   77         while (sz) {
   78                 len = DEV_BSIZE - fragsz;
   79                 if (len > sz)
   80                         len = sz;
   81                 bcopy(ptr, buffer + fragsz, len);
   82                 fragsz += len;
   83                 ptr += len;
   84                 sz -= len;
   85                 if (fragsz == DEV_BSIZE) {
   86                         error = di->dumper(di->priv, buffer, 0, dumplo,
   87                             DEV_BSIZE);
   88                         if (error)
   89                                 return error;
   90                         dumplo += DEV_BSIZE;
   91                         fragsz = 0;
   92                 }
   93         }
   94 
   95         return (0);
   96 }
   97 
   98 static int
   99 buf_flush(struct dumperinfo *di)
  100 {
  101         int error;
  102 
  103         if (fragsz == 0)
  104                 return (0);
  105 
  106         error = di->dumper(di->priv, buffer, 0, dumplo, DEV_BSIZE);
  107         dumplo += DEV_BSIZE;
  108         fragsz = 0;
  109         return (error);
  110 }
  111 
  112 static int
  113 cb_dumpdata(struct pmap_md *md, int seqnr, void *arg)
  114 {
  115         struct dumperinfo *di = (struct dumperinfo*)arg;
  116         vm_offset_t va;
  117         size_t counter, ofs, resid, sz;
  118         int c, error, twiddle;
  119 
  120         error = 0;
  121         counter = 0;    /* Update twiddle every 16MB */
  122         twiddle = 0;
  123 
  124         ofs = 0;        /* Logical offset within the chunk */
  125         resid = md->md_size;
  126 
  127         printf("  chunk %d: %lu bytes ", seqnr, (u_long)resid);
  128 
  129         while (resid) {
  130                 sz = (resid > DFLTPHYS) ? DFLTPHYS : resid;
  131                 va = pmap_dumpsys_map(md, ofs, &sz);
  132                 counter += sz;
  133                 if (counter >> 24) {
  134                         printf("%c\b", "|/-\\"[twiddle++ & 3]);
  135                         counter &= (1<<24) - 1;
  136                 }
  137 #ifdef SW_WATCHDOG
  138                 wdog_kern_pat(WD_LASTVAL);
  139 #endif
  140                 error = di->dumper(di->priv, (void*)va, 0, dumplo, sz);
  141                 pmap_dumpsys_unmap(md, ofs, va);
  142                 if (error)
  143                         break;
  144                 dumplo += sz;
  145                 resid -= sz;
  146                 ofs += sz;
  147 
  148                 /* Check for user abort. */
  149                 c = cncheckc();
  150                 if (c == 0x03)
  151                         return (ECANCELED);
  152                 if (c != -1)
  153                         printf("(CTRL-C to abort)  ");
  154         }
  155         printf("... %s\n", (error) ? "fail" : "ok");
  156         return (error);
  157 }
  158 
  159 static int
  160 cb_dumphdr(struct pmap_md *md, int seqnr, void *arg)
  161 {
  162         struct dumperinfo *di = (struct dumperinfo*)arg;
  163         Elf32_Phdr phdr;
  164         int error;
  165 
  166         bzero(&phdr, sizeof(phdr));
  167         phdr.p_type = PT_LOAD;
  168         phdr.p_flags = PF_R;                    /* XXX */
  169         phdr.p_offset = fileofs;
  170         phdr.p_vaddr = md->md_vaddr;
  171         phdr.p_paddr = md->md_paddr;
  172         phdr.p_filesz = md->md_size;
  173         phdr.p_memsz = md->md_size;
  174         phdr.p_align = PAGE_SIZE;
  175 
  176         error = buf_write(di, (char*)&phdr, sizeof(phdr));
  177         fileofs += phdr.p_filesz;
  178         return (error);
  179 }
  180 
  181 static int
  182 cb_size(struct pmap_md *md, int seqnr, void *arg)
  183 {
  184         uint32_t *sz = (uint32_t*)arg;
  185 
  186         *sz += md->md_size;
  187         return (0);
  188 }
  189 
  190 static int
  191 foreach_chunk(callback_t cb, void *arg)
  192 {
  193         struct pmap_md *md;
  194         int error, seqnr;
  195 
  196         seqnr = 0;
  197         md = pmap_scan_md(NULL);
  198         while (md != NULL) {
  199                 error = (*cb)(md, seqnr++, arg);
  200                 if (error)
  201                         return (-error);
  202                 md = pmap_scan_md(md);
  203         }
  204         return (seqnr);
  205 }
  206 
  207 void
  208 dumpsys(struct dumperinfo *di)
  209 {
  210         Elf32_Ehdr ehdr;
  211         uint32_t dumpsize;
  212         off_t hdrgap;
  213         size_t hdrsz;
  214         int error;
  215 
  216         bzero(&ehdr, sizeof(ehdr));
  217         ehdr.e_ident[EI_MAG0] = ELFMAG0;
  218         ehdr.e_ident[EI_MAG1] = ELFMAG1;
  219         ehdr.e_ident[EI_MAG2] = ELFMAG2;
  220         ehdr.e_ident[EI_MAG3] = ELFMAG3;
  221         ehdr.e_ident[EI_CLASS] = ELFCLASS32;
  222 #if BYTE_ORDER == LITTLE_ENDIAN
  223         ehdr.e_ident[EI_DATA] = ELFDATA2LSB;
  224 #else
  225         ehdr.e_ident[EI_DATA] = ELFDATA2MSB;
  226 #endif
  227         ehdr.e_ident[EI_VERSION] = EV_CURRENT;
  228         ehdr.e_ident[EI_OSABI] = ELFOSABI_STANDALONE;   /* XXX big picture? */
  229         ehdr.e_type = ET_CORE;
  230         ehdr.e_machine = EM_PPC;
  231         ehdr.e_phoff = sizeof(ehdr);
  232         ehdr.e_ehsize = sizeof(ehdr);
  233         ehdr.e_phentsize = sizeof(Elf32_Phdr);
  234         ehdr.e_shentsize = sizeof(Elf32_Shdr);
  235 
  236         /* Calculate dump size. */
  237         dumpsize = 0L;
  238         ehdr.e_phnum = foreach_chunk(cb_size, &dumpsize);
  239         hdrsz = ehdr.e_phoff + ehdr.e_phnum * ehdr.e_phentsize;
  240         fileofs = MD_ALIGN(hdrsz);
  241         dumpsize += fileofs;
  242         hdrgap = fileofs - DEV_ALIGN(hdrsz);
  243 
  244         /* For block devices, determine the dump offset on the device. */
  245         if (di->mediasize > 0) {
  246                 if (di->mediasize <
  247                     SIZEOF_METADATA + dumpsize + sizeof(kdh) * 2) {
  248                         error = ENOSPC;
  249                         goto fail;
  250                 }
  251                 dumplo = di->mediaoffset + di->mediasize - dumpsize;
  252                 dumplo -= sizeof(kdh) * 2;
  253         } else
  254                 dumplo = 0;
  255 
  256         mkdumpheader(&kdh, KERNELDUMPMAGIC, KERNELDUMP_POWERPC_VERSION, dumpsize,
  257             di->blocksize);
  258 
  259         printf("Dumping %u MB (%d chunks)\n", dumpsize >> 20,
  260             ehdr.e_phnum);
  261 
  262         /* Dump leader */
  263         error = di->dumper(di->priv, &kdh, 0, dumplo, sizeof(kdh));
  264         if (error)
  265                 goto fail;
  266         dumplo += sizeof(kdh);
  267 
  268         /* Dump ELF header */
  269         error = buf_write(di, (char*)&ehdr, sizeof(ehdr));
  270         if (error)
  271                 goto fail;
  272 
  273         /* Dump program headers */
  274         error = foreach_chunk(cb_dumphdr, di);
  275         if (error < 0)
  276                 goto fail;
  277         buf_flush(di);
  278 
  279         /*
  280          * All headers are written using blocked I/O, so we know the
  281          * current offset is (still) block aligned. Skip the alignement
  282          * in the file to have the segment contents aligned at page
  283          * boundary. We cannot use MD_ALIGN on dumplo, because we don't
  284          * care and may very well be unaligned within the dump device.
  285          */
  286         dumplo += hdrgap;
  287 
  288         /* Dump memory chunks (updates dumplo) */
  289         error = foreach_chunk(cb_dumpdata, di);
  290         if (error < 0)
  291                 goto fail;
  292 
  293         /* Dump trailer */
  294         error = di->dumper(di->priv, &kdh, 0, dumplo, sizeof(kdh));
  295         if (error)
  296                 goto fail;
  297 
  298         /* Signal completion, signoff and exit stage left. */
  299         di->dumper(di->priv, NULL, 0, 0, 0);
  300         printf("\nDump complete\n");
  301         return;
  302 
  303  fail:
  304         if (error < 0)
  305                 error = -error;
  306 
  307         if (error == ECANCELED)
  308                 printf("\nDump aborted\n");
  309         else
  310                 printf("\n** DUMP FAILED (ERROR %d) **\n", error);
  311 }

Cache object: 47549f8158d0f6e09b213b14099d2911


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