398 lines
9.1 KiB
C
398 lines
9.1 KiB
C
/*-
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* Copyright (c) 2002 Marcel Moolenaar
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include "opt_watchdog.h"
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/conf.h>
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#include <sys/cons.h>
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#include <sys/kernel.h>
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#include <sys/proc.h>
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#include <sys/kerneldump.h>
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#ifdef SW_WATCHDOG
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#include <sys/watchdog.h>
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#endif
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#include <vm/vm.h>
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#include <vm/vm_param.h>
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#include <vm/pmap.h>
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#include <machine/dump.h>
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#include <machine/elf.h>
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#include <machine/md_var.h>
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#include <machine/pcb.h>
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CTASSERT(sizeof(struct kerneldumpheader) == 512);
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/*
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* Don't touch the first SIZEOF_METADATA bytes on the dump device. This
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* is to protect us from metadata and to protect metadata from us.
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*/
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#define SIZEOF_METADATA (64*1024)
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#define MD_ALIGN(x) roundup2((off_t)(x), PAGE_SIZE)
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off_t dumplo;
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/* Handle buffered writes. */
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static size_t fragsz;
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struct dump_pa dump_map[DUMPSYS_MD_PA_NPAIRS];
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#if !defined(__powerpc__) && !defined(__sparc__)
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void
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dumpsys_gen_pa_init(void)
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{
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int n, idx;
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bzero(dump_map, sizeof(dump_map));
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for (n = 0; n < nitems(dump_map); n++) {
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idx = n * 2;
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if (dump_avail[idx] == 0 && dump_avail[idx + 1] == 0)
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break;
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dump_map[n].pa_start = dump_avail[idx];
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dump_map[n].pa_size = dump_avail[idx + 1] - dump_avail[idx];
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}
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}
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#endif
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struct dump_pa *
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dumpsys_gen_pa_next(struct dump_pa *mdp)
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{
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if (mdp == NULL)
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return (&dump_map[0]);
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mdp++;
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if (mdp->pa_size == 0)
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mdp = NULL;
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return (mdp);
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}
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void
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dumpsys_gen_wbinv_all(void)
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{
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}
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void
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dumpsys_gen_unmap_chunk(vm_paddr_t pa __unused, size_t chunk __unused,
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void *va __unused)
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{
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}
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#if !defined(__sparc__)
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int
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dumpsys_gen_write_aux_headers(struct dumperinfo *di)
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{
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return (0);
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}
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#endif
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int
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dumpsys_buf_write(struct dumperinfo *di, char *ptr, size_t sz)
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{
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size_t len;
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int error;
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while (sz) {
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len = di->blocksize - fragsz;
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if (len > sz)
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len = sz;
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memcpy((char *)di->blockbuf + fragsz, ptr, len);
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fragsz += len;
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ptr += len;
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sz -= len;
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if (fragsz == di->blocksize) {
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error = dump_write(di, di->blockbuf, 0, dumplo,
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di->blocksize);
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if (error)
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return (error);
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dumplo += di->blocksize;
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fragsz = 0;
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}
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}
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return (0);
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}
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int
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dumpsys_buf_flush(struct dumperinfo *di)
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{
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int error;
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if (fragsz == 0)
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return (0);
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error = dump_write(di, di->blockbuf, 0, dumplo, di->blocksize);
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dumplo += di->blocksize;
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fragsz = 0;
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return (error);
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}
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CTASSERT(PAGE_SHIFT < 20);
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#define PG2MB(pgs) ((pgs + (1 << (20 - PAGE_SHIFT)) - 1) >> (20 - PAGE_SHIFT))
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int
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dumpsys_cb_dumpdata(struct dump_pa *mdp, int seqnr, void *arg)
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{
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struct dumperinfo *di = (struct dumperinfo*)arg;
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vm_paddr_t pa;
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void *va;
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uint64_t pgs;
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size_t counter, sz, chunk;
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int c, error;
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u_int maxdumppgs;
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error = 0; /* catch case in which chunk size is 0 */
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counter = 0; /* Update twiddle every 16MB */
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va = NULL;
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pgs = mdp->pa_size / PAGE_SIZE;
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pa = mdp->pa_start;
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maxdumppgs = min(di->maxiosize / PAGE_SIZE, MAXDUMPPGS);
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if (maxdumppgs == 0) /* seatbelt */
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maxdumppgs = 1;
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printf(" chunk %d: %juMB (%ju pages)", seqnr, (uintmax_t)PG2MB(pgs),
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(uintmax_t)pgs);
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dumpsys_wbinv_all();
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while (pgs) {
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chunk = pgs;
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if (chunk > maxdumppgs)
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chunk = maxdumppgs;
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sz = chunk << PAGE_SHIFT;
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counter += sz;
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if (counter >> 24) {
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printf(" %ju", (uintmax_t)PG2MB(pgs));
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counter &= (1 << 24) - 1;
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}
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dumpsys_map_chunk(pa, chunk, &va);
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#ifdef SW_WATCHDOG
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wdog_kern_pat(WD_LASTVAL);
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#endif
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error = dump_write(di, va, 0, dumplo, sz);
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dumpsys_unmap_chunk(pa, chunk, va);
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if (error)
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break;
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dumplo += sz;
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pgs -= chunk;
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pa += sz;
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/* Check for user abort. */
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c = cncheckc();
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if (c == 0x03)
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return (ECANCELED);
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if (c != -1)
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printf(" (CTRL-C to abort) ");
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}
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printf(" ... %s\n", (error) ? "fail" : "ok");
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return (error);
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}
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int
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dumpsys_foreach_chunk(dumpsys_callback_t cb, void *arg)
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{
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struct dump_pa *mdp;
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int error, seqnr;
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seqnr = 0;
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mdp = dumpsys_pa_next(NULL);
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while (mdp != NULL) {
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error = (*cb)(mdp, seqnr++, arg);
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if (error)
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return (-error);
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mdp = dumpsys_pa_next(mdp);
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}
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return (seqnr);
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}
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#if !defined(__sparc__)
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static off_t fileofs;
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static int
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cb_dumphdr(struct dump_pa *mdp, int seqnr, void *arg)
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{
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struct dumperinfo *di = (struct dumperinfo*)arg;
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Elf_Phdr phdr;
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uint64_t size;
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int error;
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size = mdp->pa_size;
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bzero(&phdr, sizeof(phdr));
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phdr.p_type = PT_LOAD;
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phdr.p_flags = PF_R; /* XXX */
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phdr.p_offset = fileofs;
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#ifdef __powerpc__
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phdr.p_vaddr = (do_minidump? mdp->pa_start : ~0L);
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phdr.p_paddr = (do_minidump? ~0L : mdp->pa_start);
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#else
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phdr.p_vaddr = mdp->pa_start;
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phdr.p_paddr = mdp->pa_start;
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#endif
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phdr.p_filesz = size;
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phdr.p_memsz = size;
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phdr.p_align = PAGE_SIZE;
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error = dumpsys_buf_write(di, (char*)&phdr, sizeof(phdr));
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fileofs += phdr.p_filesz;
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return (error);
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}
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static int
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cb_size(struct dump_pa *mdp, int seqnr, void *arg)
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{
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uint64_t *sz;
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sz = (uint64_t *)arg;
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*sz += (uint64_t)mdp->pa_size;
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return (0);
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}
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int
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dumpsys_generic(struct dumperinfo *di)
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{
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static struct kerneldumpheader kdh;
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Elf_Ehdr ehdr;
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uint64_t dumpsize;
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off_t hdrgap;
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size_t hdrsz, size;
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int error;
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#ifndef __powerpc__
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if (do_minidump)
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return (minidumpsys(di));
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#endif
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bzero(&ehdr, sizeof(ehdr));
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ehdr.e_ident[EI_MAG0] = ELFMAG0;
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ehdr.e_ident[EI_MAG1] = ELFMAG1;
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ehdr.e_ident[EI_MAG2] = ELFMAG2;
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ehdr.e_ident[EI_MAG3] = ELFMAG3;
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ehdr.e_ident[EI_CLASS] = ELF_CLASS;
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#if BYTE_ORDER == LITTLE_ENDIAN
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ehdr.e_ident[EI_DATA] = ELFDATA2LSB;
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#else
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ehdr.e_ident[EI_DATA] = ELFDATA2MSB;
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#endif
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ehdr.e_ident[EI_VERSION] = EV_CURRENT;
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ehdr.e_ident[EI_OSABI] = ELFOSABI_STANDALONE; /* XXX big picture? */
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ehdr.e_type = ET_CORE;
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ehdr.e_machine = EM_VALUE;
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ehdr.e_phoff = sizeof(ehdr);
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ehdr.e_flags = 0;
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ehdr.e_ehsize = sizeof(ehdr);
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ehdr.e_phentsize = sizeof(Elf_Phdr);
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ehdr.e_shentsize = sizeof(Elf_Shdr);
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dumpsys_pa_init();
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/* Calculate dump size. */
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dumpsize = 0L;
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ehdr.e_phnum = dumpsys_foreach_chunk(cb_size, &dumpsize) +
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DUMPSYS_NUM_AUX_HDRS;
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hdrsz = ehdr.e_phoff + ehdr.e_phnum * ehdr.e_phentsize;
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fileofs = MD_ALIGN(hdrsz);
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dumpsize += fileofs;
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hdrgap = fileofs - roundup2((off_t)hdrsz, di->blocksize);
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/* Determine dump offset on device. */
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if (di->mediasize < SIZEOF_METADATA + dumpsize + di->blocksize * 2) {
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error = ENOSPC;
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goto fail;
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}
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dumplo = di->mediaoffset + di->mediasize - dumpsize;
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dumplo -= di->blocksize * 2;
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mkdumpheader(&kdh, KERNELDUMPMAGIC, KERNELDUMP_ARCH_VERSION, dumpsize,
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di->blocksize);
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printf("Dumping %ju MB (%d chunks)\n", (uintmax_t)dumpsize >> 20,
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ehdr.e_phnum - DUMPSYS_NUM_AUX_HDRS);
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/* Dump leader */
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error = dump_write_pad(di, &kdh, 0, dumplo, sizeof(kdh), &size);
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if (error)
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goto fail;
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dumplo += size;
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/* Dump ELF header */
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error = dumpsys_buf_write(di, (char*)&ehdr, sizeof(ehdr));
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if (error)
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goto fail;
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/* Dump program headers */
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error = dumpsys_foreach_chunk(cb_dumphdr, di);
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if (error < 0)
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goto fail;
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error = dumpsys_write_aux_headers(di);
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if (error < 0)
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goto fail;
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dumpsys_buf_flush(di);
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/*
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* All headers are written using blocked I/O, so we know the
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* current offset is (still) block aligned. Skip the alignement
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* in the file to have the segment contents aligned at page
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* boundary. We cannot use MD_ALIGN on dumplo, because we don't
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* care and may very well be unaligned within the dump device.
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*/
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dumplo += hdrgap;
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/* Dump memory chunks (updates dumplo) */
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error = dumpsys_foreach_chunk(dumpsys_cb_dumpdata, di);
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if (error < 0)
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goto fail;
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/* Dump trailer */
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error = dump_write_pad(di, &kdh, 0, dumplo, sizeof(kdh), &size);
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if (error)
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goto fail;
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/* Signal completion, signoff and exit stage left. */
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dump_write(di, NULL, 0, 0, 0);
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printf("\nDump complete\n");
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return (0);
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fail:
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if (error < 0)
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error = -error;
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if (error == ECANCELED)
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printf("\nDump aborted\n");
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else if (error == ENOSPC)
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printf("\nDump failed. Partition too small.\n");
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else
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printf("\n** DUMP FAILED (ERROR %d) **\n", error);
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return (error);
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}
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#endif
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